@article{1077469825,
author = {Cohen, Eckford},
title = {Unitary functions $(\mod r)$},
journal = {Duke Math. J.},
volume = {28},
number = {1},
year = {1961},
pages = { 475-485},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469825}
}
Cohen, Eckford. Unitary functions $(\mod r)$. Duke Math. J., Tome 28 (1961) no. 1, pp. 475-485. http://gdmltest.u-ga.fr/item/1077469825/