This research was partially
supported by NSF Grants DMS-9527124, DMI-0534862, and DMI-0522796, as well as
Texas ATP Grant 97-3604-010. A revised version of Chapters
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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