@book{7241,
	author = {Courant, Richard},
	title = {Introduction to Caculus and Analysis},
	publisher = {Springer Publishing Company},
	year = {1989},
	address = {India},
	url = {https://libgen.is/book/index.php?md5=3F0F92E3D30C12F8BB43FA5B9365DAD7}
}