The steiner problem with edge lengths 1 and 2,
Information Processing Letters
On better heuristic for euclidean Steiner minimum trees (extended abstract)
SFCS '91 Proceedings of the 32nd annual symposium on Foundations of computer science
Improved approximations for the Steiner tree problem
SODA '92 Proceedings of the third annual ACM-SIAM symposium on Discrete algorithms
On component-size bounded Steiner trees
Discrete Applied Mathematics - Special volume: Aridam VI and VII, Rutcor, New Brunswick, NJ, USA (1991 and 1992)
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