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@article{MZ_1993__214_1_174557, author = {Graham Ellis}, title = {Crossed squares and combinatorical homotopy.}, journal = {Mathematische Zeitschrift}, pages = {93--110}, publisher = {mathdoc}, volume = {214}, number = {1}, year = {1993}, zbl = {0789.55008}, url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174557/} }
Graham Ellis. Crossed squares and combinatorical homotopy.. Mathematische Zeitschrift, Tome 214 (1993) no. 1, pp. 93-110. http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174557/