TY  - JOUR
AU  - Andres, Jan
TI  - Periodic solutions of the third-order differential equation with right-hand side in the form of nonlinear restoring term plus general gradient-like part
JO  - Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
PY  - 1991
SP  - 143
EP  - 148
VL  - 30
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AUPO_1991__30_1_a12/
LA  - en
ID  - AUPO_1991__30_1_a12
ER  -