Trees of Shortest Paths vs. Steiner Trees: Understanding and Improving Delete Relaxation Heuristics. Keyder, E. & Geffner, H. In IJCAI 2009, Proceedings of the 21st International Joint Conference on Artificial Intelligence, Pasadena, California, USA, July 11-17, 2009, pages 1734–1739, 2009.
Trees of Shortest Paths vs. Steiner Trees: Understanding and Improving Delete Relaxation Heuristics [pdf]Paper  bibtex   

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