@book{61041,
	author = {Blumenfeld, Dennis.},
	title = {Operations research calculations handbook /},
	publisher = {CRC Press,},
	year = {2001.},
	address = {Boca Raton :},
	note = {http://www.amazon.fr/Operations-Research-Calculations-Handbook-Blumenfeld/dp/0849321271/ref=sr_1_1?ie=UTF8&qid=1413370055&sr=8-1&keywords=0849321271},
	url = {http://www.loc.gov/catdir/enhancements/fy0646/2001025425-d.html}
}