This research was
partially supported by NSF Grants CMMI-1435453, CMMI-0728011, DMI-0522796,
DMI-0534862, DMS-9527124, CMMI-1130914, and 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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