Agarwal R P, Grace S R, O’Regan D. Oscillation criteria for certain second order differential equations with deviating argument[J]. J Math Anal Appl,2001,262:601-602.
[2]
Bolat Y, Akin O. Oscillation behavior of higher order neutral type nonlinear forced differential equations with oscillating cofficients[J]. J Math Anal Appl,2004,290:302-309.
Lin W X. Interval oscillation theorems for certain second order neutral differential equations with continuous deviating arguments[J]. Southeast Asian Bulletin of Mathematics,2010,34(6):1055-1061.
[11]
Lin W X. Some oscillation theorems for systems of even order quasilinear partial differential equations[J]. Appl Math Comput,2004,152(2):337-349.
[12]
Lin W X. Oscillation for systems of high order neutral type delay partial differential equations[J]. Appl Math Comput,2004,156(1):107-114.
[13]
Lin W X. A note on oscillation for systems of high order partial differential equations of neutral type[J]. Appl Math Comput,2004,156(2):563-576.
