@book{526163,
	author = {Younas, Azka and Dr. Mubasher Jamil},
	title = {Strong Gravitational Lensing by Black Holes /},
	publisher = {SNS -  NUST,},
	year = {2015.},
	address = {Islamabad :},
	note = {Hardcover.},
	url = {http://10.250.8.41:8080/xmlui/handle/123456789/4251}
}