@book{11410,
	author = {Yahya, SM. and Mathematics.},
	title = {Introductory to set topology :},
	publisher = {Times Press ,},
	year = {2002.},
	series = {Dover books on mathematics.},
	address = {[Karachi] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/chopaconline-20}
}