Piotr Berman, Marek Karpinski, Alexander Zelikovsky. A 3/2-Approximation Algorithm for Generalized Steiner Trees in Complete Graphs with Edge Lengths 1 and 2. In Otfried Cheong, Kyung-Yong Chwa, Kunsoo Park, editors, Algorithms and Computation - 21st International Symposium, ISAAC 2010, Jeju Island, Korea, December 15-17, 2010, Proceedings, Part I. Volume 6506 of Lecture Notes in Computer Science, pages 15-24, Springer, 2010. [doi]
Abstract is missing.