@book{6447,
	author = {Wilczynski, E. J.},
	title = {Projective differential geometry of curves and ruled surfaces /},
	publisher = {B.G. Teubner ;},
	year = {1906.},
	series = {B.G. Teubners Sammlung von Lehrbüchern auf dem Gebiete der mathematischen Wissenschaften mit Einschluss ihrer Anwendungen ;},
	address = {Leipzig :},
	note = {Publisher's advertising: p. [2]-[3], 1st count and [5] p., 4th count.}
}