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@article{AM2_1973__9_136354, author = {W.D. WALLIS}, title = {On the {Existence} of {Room} {Squares}}, journal = {Aequationes mathematicae}, pages = {260--266}, publisher = {mathdoc}, volume = {9}, year = {1973}, zbl = {0267.05015}, url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136354/} }
W.D. WALLIS. On the Existence of Room Squares. Aequationes mathematicae, Tome 9 (1973), pp. 260-266. http://geodesic.mathdoc.fr/item/AM2_1973__9_136354/