Voir la notice de l'article provenant de la source European Mathematical Information Service
@article{AM_1999_150_1_a7, author = {Kevin Ford}, title = {The number of solutions of $\varphi (x)=m$}, journal = {Annals of mathematics}, publisher = {mathdoc}, volume = {150}, number = {1}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/AM_1999_150_1_a7/} }
Kevin Ford. The number of solutions of $\varphi (x)=m$. Annals of mathematics, Tome 150 (1999) no. 1. http://geodesic.mathdoc.fr/item/AM_1999_150_1_a7/