TY  - JOUR
AU  - van Vleck, F.S.
TI  - A bifurcation theorem for a class of differential equations
JO  - Portugaliae mathematica
PY  - 1965
SP  - 125
EP  - 130
VL  - 24
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1965__24_3_114958/
LA  - en
ID  - PORMA_1965__24_3_114958
ER  -