books.google.com - The Steiner problem asks for a shortest network which spans a given set of points. Minimum spanning networks have been well-studied when all connections are required to be between the given points. The novelty of the Steiner tree problem is that new auxiliary points can be introduced between the original...http://books.google.com/books/about/The_Steiner_Tree_Problem.html?id=-_yKbY3X_jUC&utm_source=gb-gplus-shareThe Steiner Tree Problem

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## The Steiner Tree ProblemBy F.K. Hwang, D.S. Richards, P. Winter |