Joseph Cheriyan, Bundit Laekhanukit, Guyslain Naves, Adrian Vetta. Approximating rooted Steiner networks. 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 1499-1511, SIAM, 2012. [doi]
Abstract is missing.