@article{GDZPPN002028824, title = {The existence of Room squares.}, journal = {Aequationes mathematicae}, volume = {13}, year = {1975}, pages = {1-8}, zbl = {0315.05014}, url = {http://dml.mathdoc.fr/item/GDZPPN002028824} }
Mullin, R.C.; Wallis, W.D. The existence of Room squares.. Aequationes mathematicae, Tome 13 (1975) pp. 1-8. http://gdmltest.u-ga.fr/item/GDZPPN002028824/