Garg, Naveen Algorithms and Complexity, MPI for Informatics, Max Planck Society;
MPI-I-97-1-027.pdf (Any fulltext), 227KB
Garg, N., Konjevod, G., & Ravi, R.(1997). A polylogarithmic approximation algorithm for group Steiner tree problem (MPI-I-97-1-027). Saarbrücken: Max-Planck-Institut für Informatik.