TY  - JOUR
AU  - Yik-Man Chiang
AU  - Shi-An Gao
TI  - On a problem in complex oscillation theory of periodic second order linear differential equations and some related perturbation results
JO  - Annales Fennici Mathematici
PY  - 2002
SP  - 273
EP  - 290
VL  - 27
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AFM_2002_27_2_a1/
LA  - en
ID  - AFM_2002_27_2_a1
ER  -