TY  - JOUR
AU  - Bebernes, J.
AU  - Schmitt, K.
TI  - An existence theorem for periodic boundary value problems for systems of second order diffferential equations
JO  - Archivum mathematicum
PY  - 1972
SP  - 173
EP  - 176
VL  - 08
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ARM_1972__8_4_a2/
LA  - en
ID  - ARM_1972__8_4_a2
ER  -