TY  - JOUR
AU  - Ramos, M.
TI  - Periodic solutions of higher order ordinary differential equations with one-sided growth restrictions on the nonlinear term
JO  - Portugaliae mathematica
PY  - 1990
SP  - 431
EP  - 436
VL  - 47
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1990__47_4_115732/
LA  - en
ID  - PORMA_1990__47_4_115732
ER  -