TY  - JOUR
AU  - Morgado, José
TI  - A property of the Euler $\varphi $-function concerning the integers which are regular modulo n
JO  - Portugaliae mathematica
PY  - 1974
SP  - 185
EP  - 191
VL  - 33
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1974__33_4_115237/
LA  - en
ID  - PORMA_1974__33_4_115237
ER  -