@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/