Petr Kolman, Christian Scheideler. Approximate duality of multicommodity multiroute flows and cuts: single source case. In Yuval Rabani, editor, Proceedings of the Twenty-Third Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2012, Kyoto, Japan, January 17-19, 2012. pages 800-810, SIAM, 2012. [doi]
Abstract is missing.