| < draft-dreibholz-tsvwg-sctpsocket-multipath-23.txt | draft-dreibholz-tsvwg-sctpsocket-multipath-24.txt > | |||
|---|---|---|---|---|
| Network Working Group T. Dreibholz | Network Working Group T. Dreibholz | |||
| Internet-Draft SimulaMet | Internet-Draft SimulaMet | |||
| Intended status: Experimental M. Becke | Intended status: Experimental M. Becke | |||
| Expires: March 10, 2022 HAW Hamburg | Expires: 22 September 2022 HAW Hamburg | |||
| H. Adhari | H. Adhari | |||
| University of Duisburg-Essen | University of Duisburg-Essen | |||
| September 06, 2021 | 21 March 2022 | |||
| SCTP Socket API Extensions for Concurrent Multipath Transfer | SCTP Socket API Extensions for Concurrent Multipath Transfer | |||
| draft-dreibholz-tsvwg-sctpsocket-multipath-23 | draft-dreibholz-tsvwg-sctpsocket-multipath-24 | |||
| Abstract | Abstract | |||
| This document describes extensions to the SCTP sockets API for | This document describes extensions to the SCTP sockets API for | |||
| configuring the CMT-SCTP and CMT/RP-SCTP extensions. | configuring the CMT-SCTP and CMT/RP-SCTP extensions. | |||
| Status of This Memo | Status of This Memo | |||
| This Internet-Draft is submitted in full conformance with the | This Internet-Draft is submitted in full conformance with the | |||
| provisions of BCP 78 and BCP 79. | provisions of BCP 78 and BCP 79. | |||
| skipping to change at page 1, line 34 ¶ | skipping to change at page 1, line 34 ¶ | |||
| Internet-Drafts are working documents of the Internet Engineering | Internet-Drafts are working documents of the Internet Engineering | |||
| Task Force (IETF). Note that other groups may also distribute | Task Force (IETF). Note that other groups may also distribute | |||
| working documents as Internet-Drafts. The list of current Internet- | working documents as Internet-Drafts. The list of current Internet- | |||
| Drafts is at https://datatracker.ietf.org/drafts/current/. | Drafts is at https://datatracker.ietf.org/drafts/current/. | |||
| Internet-Drafts are draft documents valid for a maximum of six months | Internet-Drafts are draft documents valid for a maximum of six months | |||
| and may be updated, replaced, or obsoleted by other documents at any | and may be updated, replaced, or obsoleted by other documents at any | |||
| time. It is inappropriate to use Internet-Drafts as reference | time. It is inappropriate to use Internet-Drafts as reference | |||
| material or to cite them other than as "work in progress." | material or to cite them other than as "work in progress." | |||
| This Internet-Draft will expire on March 10, 2022. | This Internet-Draft will expire on 22 September 2022. | |||
| Copyright Notice | Copyright Notice | |||
| Copyright (c) 2021 IETF Trust and the persons identified as the | Copyright (c) 2022 IETF Trust and the persons identified as the | |||
| document authors. All rights reserved. | document authors. All rights reserved. | |||
| This document is subject to BCP 78 and the IETF Trust's Legal | This document is subject to BCP 78 and the IETF Trust's Legal | |||
| Provisions Relating to IETF Documents | Provisions Relating to IETF Documents (https://trustee.ietf.org/ | |||
| (https://trustee.ietf.org/license-info) in effect on the date of | license-info) in effect on the date of publication of this document. | |||
| publication of this document. Please review these documents | Please review these documents carefully, as they describe your rights | |||
| carefully, as they describe your rights and restrictions with respect | and restrictions with respect to this document. Code Components | |||
| to this document. Code Components extracted from this document must | extracted from this document must include Revised BSD License text as | |||
| include Simplified BSD License text as described in Section 4.e of | described in Section 4.e of the Trust Legal Provisions and are | |||
| the Trust Legal Provisions and are provided without warranty as | provided without warranty as described in the Revised BSD License. | |||
| described in the Simplified BSD License. | ||||
| Table of Contents | Table of Contents | |||
| 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 | 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 | |||
| 2. Concurrent Multipath Transfer and Resource Pooling | 2. Concurrent Multipath Transfer and Resource Pooling Activation/ | |||
| Activation/Deactivation (SCTP_CMT_ON_OFF) . . . . . . . . . . 2 | Deactivation (SCTP_CMT_ON_OFF) . . . . . . . . . . . . . 2 | |||
| 3. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 3 | 3. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 | 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 | |||
| 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 | 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 3 | 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 | 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 7.1. Normative References . . . . . . . . . . . . . . . . . . 3 | 7.1. Normative References . . . . . . . . . . . . . . . . . . 3 | |||
| 7.2. Informative References . . . . . . . . . . . . . . . . . 4 | 7.2. Informative References . . . . . . . . . . . . . . . . . 4 | |||
| Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 | Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 | |||
| 1. Introduction | 1. Introduction | |||
| This draft describes extensions to the SCTP sockets API (see | This draft describes extensions to the SCTP sockets API (see [2], | |||
| [RFC6458], [RFC4960]) which allow an application to configure the | [1]) which allow an application to configure the behaviour of the | |||
| behaviour of the Concurrent Multipath Transfer (CMT) extensions CMT- | Concurrent Multipath Transfer (CMT) extensions CMT-SCTP, CMT/ | |||
| SCTP, CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like (see | RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like (see [3], [10], [5], [4], | |||
| [I-D.tuexen-tsvwg-sctp-multipath], [Globecom2010], [PAMS2012], | [7], [6], [8], [9], [11]). | |||
| [Dre2012], [PAMS2011], [SoftCOM2011], [ConTEL2011], [AINA2010], | ||||
| [IAS2006]). | ||||
| 2. Concurrent Multipath Transfer and Resource Pooling Activation/ | 2. Concurrent Multipath Transfer and Resource Pooling Activation/ | |||
| Deactivation (SCTP_CMT_ON_OFF) | Deactivation (SCTP_CMT_ON_OFF) | |||
| This socket option activates or deactivates CMT and sets the | This socket option activates or deactivates CMT and sets the | |||
| corresponding Resource Pooling variant to be applied. The | corresponding Resource Pooling variant to be applied. The | |||
| sctp_assoc_value structure is used to specify the association for | sctp_assoc_value structure is used to specify the association for | |||
| which the CMT state should be changed and the new CMT state. | which the CMT state should be changed and the new CMT state. | |||
| Definition of the sctp_assoc_value structure: | Definition of the sctp_assoc_value structure: | |||
| struct sctp_assoc_value { | struct sctp_assoc_value { | |||
| sctp_assoc_t assoc_id; | sctp_assoc_t assoc_id; | |||
| uint32_t assoc_value; | uint32_t assoc_value; | |||
| }; | }; | |||
| assoc_id: Holds the identifier for the association of which the CMT | assoc_id: Holds the identifier for the association of which the CMT | |||
| state should be changed. Ignored for one-to-one style sockets. | state should be changed. Ignored for one-to-one style sockets. | |||
| assoc_value: | assoc_value: 0 Turns CMT off. | |||
| 0 Turns CMT off. | ||||
| 1 Turns plain CMT-SCTP on. No Resource Pooling is applied. | 1 Turns plain CMT-SCTP on. No Resource Pooling is | |||
| applied. | ||||
| 2 Turns CMT-SCTP on. CMT/RPv1 Resource Pooling as defined in | 2 Turns CMT-SCTP on. CMT/RPv1 Resource Pooling as | |||
| [AINA2010] is applied. | defined in [9] is applied. | |||
| 3 Turns CMT-SCTP on. CMT/RPv2 Resource Pooling as defined in | 3 Turns CMT-SCTP on. CMT/RPv2 Resource Pooling as | |||
| [ConTEL2011] is applied. | defined in [8] is applied. | |||
| 4 Turns CMT-SCTP on. MPTCP-like Resource Pooling as defined in | 4 Turns CMT-SCTP on. MPTCP-like Resource Pooling as | |||
| [SoftCOM2011], [ConTEL2011], [PAMS2012] is applied. | defined in [6], [8], [5] is applied. | |||
| 3. Testbed Platform | 3. Testbed Platform | |||
| A large-scale and realistic Internet testbed platform with support | A large-scale and realistic Internet testbed platform with support | |||
| for the multi-homing feature of the underlying SCTP protocol is | for the multi-homing feature of the underlying SCTP protocol is | |||
| NorNet. A description of NorNet is provided in [PAMS2013-NorNet], | NorNet. A description of NorNet is provided in [12], [13], some | |||
| [ComNets2013-Core], some further information can be found on the | further information can be found on the project website [14]. | |||
| project website [NorNet-Website]. | ||||
| 4. Security Considerations | 4. Security Considerations | |||
| Security considerations for the SCTP sockets API are described by | Security considerations for the SCTP sockets API are described by | |||
| [RFC6458]. | [2]. | |||
| 5. IANA Considerations | 5. IANA Considerations | |||
| This document does not require IANA actions. | This document does not require IANA actions. | |||
| 6. Acknowledgments | 6. Acknowledgments | |||
| The authors would like to thank Michael Tuexen for his support. | The authors would like to thank Michael Tuexen for his support. | |||
| 7. References | 7. References | |||
| 7.1. Normative References | 7.1. Normative References | |||
| [I-D.tuexen-tsvwg-sctp-multipath] | [1] Stewart, R., Ed., "Stream Control Transmission Protocol", | |||
| Amer, P. D., Becke, M., Dreibholz, T., Ekiz, N., Iyengar, | ||||
| J., Natarajan, P., Stewart, R. R., and M. Tuexen, "Load | ||||
| Sharing for the Stream Control Transmission Protocol | ||||
| (SCTP)", draft-tuexen-tsvwg-sctp-multipath-22 (work in | ||||
| progress), August 2021. | ||||
| [RFC4960] Stewart, R., Ed., "Stream Control Transmission Protocol", | ||||
| RFC 4960, DOI 10.17487/RFC4960, September 2007, | RFC 4960, DOI 10.17487/RFC4960, September 2007, | |||
| <https://www.rfc-editor.org/info/rfc4960>. | <https://www.rfc-editor.org/info/rfc4960>. | |||
| [RFC6458] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. | [2] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. | |||
| Yasevich, "Sockets API Extensions for the Stream Control | Yasevich, "Sockets API Extensions for the Stream Control | |||
| Transmission Protocol (SCTP)", RFC 6458, | Transmission Protocol (SCTP)", RFC 6458, | |||
| DOI 10.17487/RFC6458, December 2011, | DOI 10.17487/RFC6458, December 2011, | |||
| <https://www.rfc-editor.org/info/rfc6458>. | <https://www.rfc-editor.org/info/rfc6458>. | |||
| [3] Amer, P. D., Becke, M., Dreibholz, T., Ekiz, N., Iyengar, | ||||
| J., Natarajan, P., Stewart, R. R., and M. Tuexen, "Load | ||||
| Sharing for the Stream Control Transmission Protocol | ||||
| (SCTP)", Work in Progress, Internet-Draft, draft-tuexen- | ||||
| tsvwg-sctp-multipath-23, 9 February 2022, | ||||
| <https://www.ietf.org/archive/id/draft-tuexen-tsvwg-sctp- | ||||
| multipath-23.txt>. | ||||
| 7.2. Informative References | 7.2. Informative References | |||
| [AINA2010] | [4] Dreibholz, T., "Evaluation and Optimisation of Multi-Path | |||
| Dreibholz, T., Becke, M., Pulinthanath, J., and E. | Transport using the Stream Control Transmission | |||
| Protocol", Habilitation Treatise, 13 March 2012, | ||||
| <https://duepublico.uni-duisburg- | ||||
| essen.de/servlets/DerivateServlet/Derivate-29737/ | ||||
| Dre2012_final.pdf>. | ||||
| [5] Dreibholz, T., Adhari, H., Becke, M., and E. P. Rathgeb, | ||||
| "Simulation and Experimental Evaluation of Multipath | ||||
| Congestion Control Strategies", Proceedings of the 2nd | ||||
| International Workshop on Protocols and Applications with | ||||
| Multi-Homing Support (PAMS) ISBN 978-0-7695-4652-0, | ||||
| DOI 10.1109/WAINA.2012.186, 29 March 2012, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/PAMS2012.pdf>. | ||||
| [6] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb, | ||||
| "Evaluation of A New Multipath Congestion Control Scheme | ||||
| using the NetPerfMeter Tool-Chain", Proceedings of the | ||||
| 19th IEEE International Conference on Software, | ||||
| Telecommunications and Computer Networks (SoftCOM) Pages | ||||
| 1-6, ISBN 978-953-290-027-9, 16 September 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/SoftCOM2011.pdf>. | ||||
| [7] Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E. P., and | ||||
| M. Tüxen, "Evaluation of Concurrent Multipath Transfer | ||||
| over Dissimilar Paths", Proceedings of the 1st | ||||
| International Workshop on Protocols and Applications with | ||||
| Multi-Homing Support (PAMS) Pages 708-714, | ||||
| ISBN 978-0-7695-4338-3, DOI 10.1109/WAINA.2011.92, 22 | ||||
| March 2011, <https://www.wiwi.uni- | ||||
| due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | ||||
| PAMS2011.pdf>. | ||||
| [8] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb, | ||||
| "On the Impact of Congestion Control for Concurrent | ||||
| Multipath Transfer on the Transport Layer", Proceedings of | ||||
| the 11th IEEE International Conference on | ||||
| Telecommunications (ConTEL) Pages 397-404, | ||||
| ISBN 978-953-184-152-8, 16 June 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/ConTEL2011.pdf>. | ||||
| [9] Dreibholz, T., Becke, M., Pulinthanath, J., and E. P. | ||||
| Rathgeb, "Applying TCP-Friendly Congestion Control to | Rathgeb, "Applying TCP-Friendly Congestion Control to | |||
| Concurrent Multipath Transfer", Proceedings of the 24th | Concurrent Multipath Transfer", Proceedings of the 24th | |||
| IEEE International Conference on Advanced Information | IEEE International Conference on Advanced Information | |||
| Networking and Applications (AINA) Pages 312-319, | Networking and Applications (AINA) Pages 312-319, | |||
| ISBN 978-0-7695-4018-4, DOI 10.1109/AINA.2010.117, April | ISBN 978-0-7695-4018-4, DOI 10.1109/AINA.2010.117, 21 | |||
| 2010, <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | April 2010, <https://www.wiwi.uni- | |||
| TDR/SCTP/Paper/AINA2010.pdf>. | ||||
| [ComNets2013-Core] | ||||
| Gran, E., Dreibholz, T., and A. Kvalbein, "NorNet Core - A | ||||
| Multi-Homed Research Testbed", Computer Networks, Special | ||||
| Issue on Future Internet Testbeds Volume 61, Pages 75-87, | ||||
| ISSN 1389-1286, DOI 10.1016/j.bjp.2013.12.035, March 2014, | ||||
| <https://www.simula.no/file/simulasimula2236pdf/download>. | ||||
| [ConTEL2011] | ||||
| Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, "On | ||||
| the Impact of Congestion Control for Concurrent Multipath | ||||
| Transfer on the Transport Layer", Proceedings of the 11th | ||||
| IEEE International Conference on | ||||
| Telecommunications (ConTEL) Pages 397-404, | ||||
| ISBN 978-953-184-152-8, June 2011, <https://www.wiwi.uni- | ||||
| due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | |||
| ConTEL2011.pdf>. | AINA2010.pdf>. | |||
| [Dre2012] Dreibholz, T., "Evaluation and Optimisation of Multi-Path | ||||
| Transport using the Stream Control Transmission | ||||
| Protocol", Habilitation Treatise, March 2012, | ||||
| <https://duepublico.uni-duisburg- | ||||
| essen.de/servlets/DerivateServlet/Derivate-29737/ | ||||
| Dre2012_final.pdf>. | ||||
| [Globecom2010] | [10] Dreibholz, T., Becke, M., Rathgeb, E. P., and M. Tüxen, | |||
| Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "On | "On the Use of Concurrent Multipath Transfer over | |||
| the Use of Concurrent Multipath Transfer over Asymmetric | Asymmetric Paths", Proceedings of the IEEE Global | |||
| Paths", Proceedings of the IEEE Global Communications | Communications | |||
| Conference (GLOBECOM) ISBN 978-1-4244-5637-6, | Conference (GLOBECOM) ISBN 978-1-4244-5637-6, | |||
| DOI 10.1109/GLOCOM.2010.5683579, December 2010, | DOI 10.1109/GLOCOM.2010.5683579, 7 December 2010, | |||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | |||
| TDR/SCTP/Paper/Globecom2010.pdf>. | TDR/SCTP/Paper/Globecom2010.pdf>. | |||
| [IAS2006] Iyengar, J., Amer, P., and R. Stewart, "Concurrent | [11] Iyengar, J. R., Amer, P. D., and R. Stewart, "Concurrent | |||
| Multipath Transfer Using SCTP Multihoming Over Independent | Multipath Transfer Using SCTP Multihoming Over Independent | |||
| End-to-End Paths", IEEE/ACM Transactions on | End-to-End Paths", IEEE/ACM Transactions on | |||
| Networking, Volume 14, Number 5, Pages 951-964, | Networking, Volume 14, Number 5, Pages 951-964, | |||
| ISSN 1063-6692, DOI 10.1109/TNET.2006.882843, October | ISSN 1063-6692, DOI 10.1109/TNET.2006.882843, October | |||
| 2006, | 2006, | |||
| <http://www.fandm.edu/jiyengar/papers/cmt-ton2006.pdf>. | <http://www.fandm.edu/jiyengar/papers/cmt-ton2006.pdf>. | |||
| [NorNet-Website] | [12] Dreibholz, T. and E. G. Gran, "Design and Implementation | |||
| Dreibholz, T., "NorNet - A Real-World, Large-Scale Multi- | of the NorNet Core Research Testbed for Multi-Homed | |||
| Homing Testbed", Online: https://www.nntb.no/, 2019, | Systems", Proceedings of the 3nd International Workshop on | |||
| <https://www.nntb.no/>. | Protocols and Applications with Multi-Homing | |||
| Support (PAMS) Pages 1094-1100, ISBN 978-0-7695-4952-1, | ||||
| [PAMS2011] | DOI 10.1109/WAINA.2013.71, 27 March 2013, | |||
| Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E., and M. | ||||
| Tuexen, "Evaluation of Concurrent Multipath Transfer over | ||||
| Dissimilar Paths", Proceedings of the 1st International | ||||
| Workshop on Protocols and Applications with Multi-Homing | ||||
| Support (PAMS) Pages 708-714, ISBN 978-0-7695-4338-3, | ||||
| DOI 10.1109/WAINA.2011.92, March 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/PAMS2011.pdf>. | ||||
| [PAMS2012] | ||||
| Dreibholz, T., Adhari, H., Becke, M., and E. Rathgeb, | ||||
| "Simulation and Experimental Evaluation of Multipath | ||||
| Congestion Control Strategies", Proceedings of the 2nd | ||||
| International Workshop on Protocols and Applications with | ||||
| Multi-Homing Support (PAMS) ISBN 978-0-7695-4652-0, | ||||
| DOI 10.1109/WAINA.2012.186, March 2012, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/PAMS2012.pdf>. | ||||
| [PAMS2013-NorNet] | ||||
| Dreibholz, T. and E. Gran, "Design and Implementation of | ||||
| the NorNet Core Research Testbed for Multi-Homed Systems", | ||||
| Proceedings of the 3nd International Workshop on Protocols | ||||
| and Applications with Multi-Homing Support (PAMS) Pages | ||||
| 1094-1100, ISBN 978-0-7695-4952-1, | ||||
| DOI 10.1109/WAINA.2013.71, March 2013, | ||||
| <https://www.simula.no/file/ | <https://www.simula.no/file/ | |||
| threfereedinproceedingsreference2012-12-207643198512pdf/ | threfereedinproceedingsreference2012-12-207643198512pdf/ | |||
| download>. | download>. | |||
| [SoftCOM2011] | [13] Gran, E. G., Dreibholz, T., and A. Kvalbein, "NorNet Core | |||
| Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, | – A Multi-Homed Research Testbed", Computer Networks, | |||
| "Evaluation of A New Multipath Congestion Control Scheme | Special Issue on Future Internet Testbeds Volume 61, Pages | |||
| using the NetPerfMeter Tool-Chain", Proceedings of the | 75-87, ISSN 1389-1286, DOI 10.1016/j.bjp.2013.12.035, 14 | |||
| 19th IEEE International Conference on Software, | March 2014, | |||
| Telecommunications and Computer Networks (SoftCOM) Pages | <https://www.simula.no/file/simulasimula2236pdf/download>. | |||
| 1-6, ISBN 978-953-290-027-9, September 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | [14] Dreibholz, T., "NorNet – A Real-World, Large-Scale Multi- | |||
| TDR/SCTP/Paper/SoftCOM2011.pdf>. | Homing Testbed", 2022, <https://www.nntb.no/>. | |||
| Authors' Addresses | Authors' Addresses | |||
| Thomas Dreibholz | Thomas Dreibholz | |||
| Simula Metropolitan Centre for Digital Engineering | Simula Metropolitan Centre for Digital Engineering | |||
| Pilestredet 52 | Pilestredet 52 | |||
| 0167 Oslo, Oslo | 0167 Oslo | |||
| Norway | Norway | |||
| Phone: +47-6782-8200 | ||||
| Fax: +47-6782-8201 | ||||
| Email: dreibh@simula.no | Email: dreibh@simula.no | |||
| URI: https://www.simula.no/people/dreibh | URI: https://www.simula.no/people/dreibh | |||
| Martin Becke | Martin Becke | |||
| HAW Hamburg, Informatics Department | HAW Hamburg, Informatics Department | |||
| Berliner Tor 7 | Berliner Tor 7 | |||
| 20099 Hamburg, Hamburg | 20099 Hamburg | |||
| Germany | Germany | |||
| Phone: +49-40-42875-8104 | Phone: +49-40-42875-8104 | |||
| Fax: +49-40-42875-8309 | ||||
| Email: martin.becke@haw-hamburg.de | Email: martin.becke@haw-hamburg.de | |||
| URI: http://www.scimbe.de/about.html | URI: http://www.scimbe.de/about.html | |||
| Hakim Adhari | Hakim Adhari | |||
| University of Duisburg-Essen, Institute for Experimental Mathematics | University of Duisburg-Essen, Institute for Experimental Mathematics | |||
| Ellernstrasse 29 | Ellernstraße 29 | |||
| 45326 Essen, Nordrhein-Westfalen | 45326 Essen | |||
| Germany | Germany | |||
| Phone: +49-201-183-7667 | ||||
| Fax: +49-201-183-7673 | ||||
| Email: hakim.adhari@uni-due.de | Email: hakim.adhari@uni-due.de | |||
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| 132 lines changed or deleted | 115 lines changed or added | |||
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