TY  - JOUR
AU  - Zhiting Xu
TI  - Fite and Kamenev type oscillation criteria for
 second order elliptic equations
JO  - Annales Polonici Mathematici
PY  - 2007
SP  - 199
EP  - 214
VL  - 92
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap92-3-1/
DO  - 10.4064/ap92-3-1
LA  - en
ID  - 10_4064_ap92_3_1
ER  -