@article{1077472821, author = {Haviland, E. K.}, title = {An analogue of Euler's $\varphi$ -function}, journal = {Duke Math. J.}, volume = {11}, number = {1}, year = {1944}, pages = { 869-872}, language = {en}, url = {http://dml.mathdoc.fr/item/1077472821} }
Haviland, E. K. An analogue of Euler’s $\varphi$ -function. Duke Math. J., Tome 11 (1944) no. 1, pp. 869-872. http://gdmltest.u-ga.fr/item/1077472821/