@article{GDZPPN002025507, title = {On the Existence of Room Squares of Order 4n}, journal = {Aequationes mathematicae}, volume = {7}, year = {1971}, pages = {306-309}, zbl = {0236.05015}, url = {http://dml.mathdoc.fr/item/GDZPPN002025507} }
MULLIN, R.C.; WALLIS, W.D. On the Existence of Room Squares of Order 4n. Aequationes mathematicae, Tome 7 (1971) pp. 306-309. http://gdmltest.u-ga.fr/item/GDZPPN002025507/