@article{1183734009,
author = {Salomaa, Arto},
title = {A Theorem Concerning the Composition of Functions of Several Variables Ranging Over a Finite Set},
journal = {J. Symbolic Logic},
volume = {25},
number = {1},
year = {1960},
pages = { 203-208},
language = {en},
url = {http://dml.mathdoc.fr/item/1183734009}
}
Salomaa, Arto. A Theorem Concerning the Composition of Functions of Several Variables Ranging Over a Finite Set. J. Symbolic Logic, Tome 25 (1960) no. 1, pp. 203-208. http://gdmltest.u-ga.fr/item/1183734009/