@article{AM2_1978__17_136750,
     author = {S.A. Vanstone and R.C. Mullin and M. Deza},
     title = {Orthogonal systems.},
     journal = {Aequationes mathematicae},
     pages = {322--330},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0377.05012},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136750/}
}