@book{67748,
	author = {Ball, W. W. Rouse},
	title = {Mathematical Recreations and Essays},
	publisher = {Project Gutenberg,},
	year = {2008},
	address = {Salt Lake City, UT :},
	note = {Release date is 2008-10-08},
	url = {https://www.gutenberg.org/ebooks/26839}
}