New approximation algorithms for the Steiner tree problems

Marek Karpinski and Alexander Zelikovsky
Tech. report TR95-030, Electronic Colloq. on Computational Complexity, 1995
J. Combinatorial Optimization 1(1):47–66, 1997
Tech. report TR-95-036, Univ. of California, Berkeley, International Computer Science Inst., 1995


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