@book{11481,
	author = {Gupta, Prem Kumar},
	title = {Operations research},
	publisher = {S. Chand & Company},
	year = {2014},
	address = {New Delhi},
	url = {https://libgen.is/book/index.php?md5=7F2A37D785A9322FAB03E65EE423919C}
}