@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/}
}