@article{2236,
author = {Copi, Irving M. and Harary, Frank},
title = {Some properties of n-adic relations},
journal = {Portugaliae mathematica},
volume = {12},
year = {1953},
pages = {143-152},
zbl = {0052.04702},
mrnumber = {0060481},
language = {en},
url = {http://dml.mathdoc.fr/item/2236}
}
Copi, Irving M.; Harary, Frank. Some properties of n-adic relations. Portugaliae mathematica, Tome 12 (1953) pp. 143-152. http://gdmltest.u-ga.fr/item/2236/