@book{1395,
	author = {N.Subrahmanyam and " Brij Lal , M.N.Avadhanulu,,,"},
	title = {A Text Book of Optics (23nd ed.)},
	publisher = {S. Chand},
	year = {2006},
	address = {NEW DELHI},
	edition = {23TH},
	note = {Quantity Number:  20}
}