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@article{AM2_1980__20_182408, author = {M.J. Pelling and D.G. Rogers}, title = {Some (2, n) combinatorial {Stein} groupoids. {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {319--320}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0465.20064}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182408/} }
M.J. Pelling; D.G. Rogers. Some (2, n) combinatorial Stein groupoids. (Short Communication).. Aequationes mathematicae, Tome 20 (1980), pp. 319-320. http://geodesic.mathdoc.fr/item/AM2_1980__20_182408/