TY  - JOUR
AU  - Karim, Rahmi Ibrahim Ibrahim Abdel
TI  - Note on the periodic solutions of systems of ordinary differential equations
JO  - Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
PY  - 1972
SP  - 7
EP  - 14
VL  - 12
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AUPO_1972__12_1_a0/
LA  - en
ID  - AUPO_1972__12_1_a0
ER  -