@book{6494,
	author = {Johnsonbaugh, Richard.},
	title = {Discrete Mathematics /},
	publisher = {Prentice Hall,},
	year = {2004.},
	address = {[S.l.] :},
	edition = {6th ed.},
	url = {http://10.10.170.122:8080/browse/book/19045}
}