@book{26698,
	author = {Coxete, H.S.M.  and International Congress on M.C. Escher and Coxeter, H. S. M...(et. al).},
	title = {M.C. Escher, art and science :},
	publisher = {North-Holland ;},
	year = {1986.},
	address = {New York :}
}