Mohammad Taghi Hajiaghayi, Kamal Jain. The prize-collecting generalized steiner tree problem via a new approach of primal-dual schema. In Proceedings of the Seventeenth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2006, Miami, Florida, USA, January 22-26, 2006. pages 631-640, ACM Press, 2006. [doi]
Abstract is missing.