@book {,
	title = {I principi della filosofia},
	volume = {volume},
	number = {90},
	year = {1967},
	pages = {515},
	publisher = {Boringhieri},
	organization = {Boringhieri},
	address = {Torino},
	author = {Ren{\'e} Descartes},
	editor = {Paolo Cristofolini}
}
