@book{523,
	author = {Silberschatz, Abraham. and Korth, Henry F.},
	title = {Database system concepts/},
	publisher = { McGraw-Hill,},
	year = {c1997.},
	series = {McGraw-Hill series in computer science},
	address = {New York :},
	edition = {3rd ed.},
	note = {Korth’s name appears first on earlier editions.}
}