@book{70631,
	author = {Volterra, Vito,},
	title = {Leçons sur l'intégration des équations différentielles aux dérivées partielles, :},
	publisher = {Project Gutenberg,},
	year = {2009},
	address = {Salt Lake City, UT :},
	note = {Release date is 2009-08-24},
	url = {https://www.gutenberg.org/ebooks/29783}
}