TY  - JOUR
AU  - To Fu Ma
TI  - A note on the existence of two nontrivial solutions of a resonance problem.
JO  - Portugaliae mathematica
PY  - 1994
SP  - 517
EP  - 523
VL  - 51
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1994__51_4_47276/
LA  - en
ID  - PORMA_1994__51_4_47276
ER  -