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@article{AM2_1971__6_136204, author = {R.C. MULLIN and W.D. WALLIS}, title = {On the {Existence} of {Room} {Squares} of {Order} 4n}, journal = {Aequationes mathematicae}, pages = {306--309}, publisher = {mathdoc}, volume = {6}, year = {1971}, zbl = {0236.05015}, url = {http://geodesic.mathdoc.fr/item/AM2_1971__6_136204/} }
R.C. MULLIN; W.D. WALLIS. On the Existence of Room Squares of Order 4n. Aequationes mathematicae, Tome 6 (1971), pp. 306-309. http://geodesic.mathdoc.fr/item/AM2_1971__6_136204/