@book{11480,
	author = {Gupta, Prem Kumar},
	title = {Operations research},
	publisher = {S. Chand & Company},
	year = {2007},
	address = {New Dehli},
	url = {https://libgen.is/book/index.php?md5=77A98ECF0660862D54DDC2716EBB1DE8}
}