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Sven Oliver Krumke, Hartmut Noltemeier, Madhav V. Marathe, R. Ravi, S. S. Ravi, Ravi Sundaram, Hans-Christoph Wirth. Improving Spanning Trees by Upgrading Nodes. Theoretical Computer Science, 221(1-2):139-155, 1999. [doi]
Abstract is missing.