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@article{PORMA_1953__12_4_114726, author = {Copi, Irving M. and Harary, Frank}, title = {Some properties of n-adic relations}, journal = {Portugaliae mathematica}, pages = {143--152}, publisher = {mathdoc}, volume = {12}, number = {4}, year = {1953}, mrnumber = {0060481}, zbl = {0052.04702}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1953__12_4_114726/} }
Copi, Irving M.; Harary, Frank. Some properties of n-adic relations. Portugaliae mathematica, Tome 12 (1953) no. 4, pp. 143-152. http://geodesic.mathdoc.fr/item/PORMA_1953__12_4_114726/