2Rogovchenko Yu V. On oscillation of a second order nonlinear delay differential equation. Funkcial.Ekvac. 2000, 43: 1-29.
3Jurang Yan. Oscillation theorems for second order linear differential equations with damping.Proc. Amer. math. Soc., 1986, 98: 276-282.
4Cecchi M and Marini M. Oscillatory and nonoscillatory behavior of a second order functional differential equation. Rocky Mount. J. Math., 1992, 22: 1259-1276.
5Ladde G S, Lakshmikantham V, and Zhang B G. Oscillation Theory of Differential Equations with Deviating Arguments. Marcel Dekker, New York, 1987.
6Aydin Tiryaki,A. Okay ?elebi.Nonoscillation and asymptotic behaviour for third order nonlinear differential equations[J]. Czechoslovak Mathematical Journal . 1998 (4)
7L. Erbe.Oscillation, nonoscillation, and asymptotic behavior for third order nonlinear differential equations[J]. Annali di Matematica Pura ed Applicata, Series 4 . 1976 (1)
8Erbe L.Existence of oscillatory solutions and asymptotic behaviour for a class of a third order lineardifferential equations. Pacific Journal of Mathematics . 1976
9Hanan M.Oscillation criteria for a third order linear differential equations. Pacific Journal of Mathematics . 1961
10Waltman P.Oscillation criteria for third order nonlinear differential equations. Pacific Journal of Mathematics . 1966