TY  - JOUR
AU  - Jones, John jr.
TI  - On oscillatory solutions of second order differential systems
JO  - Portugaliae mathematica
PY  - 1970
SP  - 125
EP  - 133
VL  - 29
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1970__29_2_115117/
LA  - en
ID  - PORMA_1970__29_2_115117
ER  -