This research was partially
supported by NSF Grant DMS-9527124 and Texas ATP Grant 97-3604-010. A
revised version of Chapters 2 and
4 of this manual now appears in the Springer-Verlag book
Computational Combinatorial Optimization edited by M. Jünger and
D. Naddef, see
http://link.springer.de/link/service/series/0558/tocs/t2241.htm
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