TY  - JOUR
AU  - S. Sędziwy
TI  - On periodic solutions of a certain third-order non-linear differential equation
JO  - Annales Polonici Mathematici
PY  - 1965
SP  - 147
EP  - 154
VL  - 17
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-17-2-147-154/
DO  - 10.4064/ap-17-2-147-154
LA  - en
ID  - 10_4064_ap_17_2_147_154
ER  -