TY  - JOUR
AU  - Zanolin, Fabio
TI  - Periodic solutions for second order differential systems with damping
JO  - Rendiconti del Seminario Matematico della Università di Padova
PY  - 1981
SP  - 223
EP  - 234
VL  - 65
PB  - Seminario Matematico of the University of Padua
UR  - http://archive.numdam.org/item/RSMUP_1981__65__223_0/
LA  - en
ID  - RSMUP_1981__65__223_0
ER  -