1. The Design and Analysis of Computer Algorithms;Aho,1974
2. Graph Theory: An Algorithmic Approach;Christofides,1975
3. Locating an obnoxious facility on a network;Church;Transportation Sci.,1978
4. Bottleneck extrema;Edmonds;J. Combinatorial Theory,1970
5. Computers and Intractability: A Guide to the Theory of NP-Completeness;Garey,1979