@book{70636,
	author = {Hadamard, Jacques,},
	title = {Four Lectures on Mathematics, Delivered at Columbia University in 1911},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-08-24},
	url = {https://www.gutenberg.org/ebooks/29788}
}