TY  - JOUR
AU  - Kevin Ford
TI  - The number of solutions of \(\varphi (x)=m\)
JO  - Annals of mathematics
PY  - 1999
VL  - 150
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.2307/121103/
DO  - 10.2307/121103
ID  - 10_2307_121103
ER  -