@book{214025,
	author = {Baues, Hans J., and ebrary, Inc.},
	title = {Combinatorial homotopy and 4-dimensional complexes},
	publisher = {W. de Gruyter,},
	year = {1991.},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10599436}
}