%0 Journal Article
%A Graham Ellis
%T Crossed squares and combinatorical homotopy.
%J Mathematische Zeitschrift
%D 1993
%P 93-110
%V 214
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174557/
%F MZ_1993__214_1_174557