http://www.saddleback.edu/faculty/fgonzalez/Spring_2010/Math_2/csg_ch07.pdf
http://www.e-booksdirectory.com/details.php?ebook=2647
http://www.princeton.edu/~rvdb/LPbook/
http://web.mit.edu/15.053/www/AMP-Chapter-04.pdf
http://www.cs.berkeley.edu/~vazirani/algorithms/chap7.pdf
http://books.google.com/books?id=Sld1YYAedtgC&printsec=frontcover#v=onepage&q&f=false
http://www.sce.carleton.ca/faculty/chinneck/po/Chapter2.pdf
http://www.neos-guide.org/lp-faq
http://www.neos-guide.org/non-lp-faq
http://highered.mcgraw-hill.com/sites/dl/free/0073129038/449982/Chapter14.pdf
http://orfe.princeton.edu/~rvdb/tex/INFORMSDenver/tutorial3.pdf