@book{720,
	author = {"Thomas, George B."},
	title = {Calculus and analytic geometry},
	publisher = {Pearson Education Publisher},
	address = {new dehli},
	edition = {9th},
	url = {https://libgen.is/book/index.php?md5=9A6DEBB229BE3FCFE28C7A55A4AF76A4}
}