@book{26217,
	author = {Gardner, Martin,},
	title = {The 2nd Scientific American book of mathematical puzzles & diversions /},
	publisher = {University of Chicago Press,},
	year = {1987.},
	address = {Chicago :},
	edition = {University of Chicago Press ed.},
	note = {Cover title: The second Scientific American book of mathematical puzzles and diversions.},
	url = {http://www.loc.gov/catdir/enhancements/fy0609/87010760-b.html}
}