@book{7411,
	author = {Croom, Fred H.},
	title = {Principles of Topology},
	publisher = {Cambridge University Press},
	year = {2008},
	address = {New Delhi},
	url = {https://libgen.is/book/index.php?md5=44F0758DF37ED0F8DA104E6E7BF86084}
}