Abstract
The Steiner tree problem is to find a tree in a connected undirected distance graph G=(V, E, d) which spans a given set S contained in V. The minimum Steiner tree for G and S is a tree which spans S with a minimum total distance on its edges. The authors consider a special case of the Steiner tree problem in graphs. For this problem they assume that the underlying graph G does not have any direct edge between the vertices in S contained in V. The problem is to find a tree in G which spans the vertices in S and uses minimum number of vertices in V-S. >
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