TY  - JOUR
AU  - Y.-F. S. Pétermann
TI  - Changes of sign of error terms related to Euler's function and to divisor functions.
JO  - Commentarii mathematici Helvetici
PY  - 1986
SP  - 84
EP  - 101
VL  - 61
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1986__61_140042/
ID  - CMH_1986__61_140042
ER  -