TY  - JOUR
AU  - Kusano, Takaŝi
AU  - Naito, Manabu
TI  - Nonlinear Oscillation of Fourth Order Differential Equations
JO  - Canadian journal of mathematics
PY  - 1976
SP  - 840
EP  - 852
VL  - 28
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-081-0/
DO  - 10.4153/CJM-1976-081-0
ID  - 10_4153_CJM_1976_081_0
ER  -