@book{6507,
	author = {Veblen, Oswald.},
	title = {Analysis situs /},
	publisher = {American Mathematical Society,},
	year = {1931.},
	series = {American mathematical society. Colloquium publications. vol. v, pt. II},
	address = {New York,},
	edition = {2d. ed.},
	note = {includes index.}
}