Sven Oliver Krumke, Hartmut Noltemeier, S. S. Ravi, Madhav V. Marathe. Complexity and Approximability of Certain Bicriteria Location Problems. In Manfred Nagl, editor, Graph-Theoretic Concepts in Computer Science, 21st International Workshop, WG 95, Aachen, Germany, June 20-22, 1995, Proceedings. Volume 1017 of Lecture Notes in Computer Science, pages 73-87, Springer, 1995.
Abstract is missing.