Moses Charikar, Adriana Karagiozova. On non-uniform multicommodity buy-at-bulk network design. In Harold N. Gabow, Ronald Fagin, editors, Proceedings of the 37th Annual ACM Symposium on Theory of Computing, Baltimore, MD, USA, May 22-24, 2005. pages 176-182, ACM, 2005. [doi]
Abstract is missing.