@book{6540,
	author = {Chiang,Alpha C.},
	title = {Fundamental  methods of mathematical economics},
	publisher = {McGraw Hill},
	address = {Boston},
	edition = {4th},
	url = {https://libgen.is/book/index.php?md5=52F485D81AD9A9DD1663F4707C42F8E2}
}