@book{10301,
	author = {Lipschutz, Seymour. and Lipson, Marc.},
	title = {2000 solved problems in discrete mathematics /},
	publisher = {Tata McGraw-Hill,},
	year = {c1992 [reprinted 2003].},
	series = {Schaum's solved problems series},
	address = {New York ;},
	note = {Includes index.}
}