[1] GRACE S. R.: Oscillation theorems for damped functional differential equations. Funkcial. Ekvac. 35 (1992), 261-278. MR 1189896 | Zbl 0758.34053

[2] GRACE S. R.: Oscillatory and asymptotic behaviour of damped functional differential equations. Math. Nachr. 142 (1989), 279-305. MR 1017387

[3] GRACE S. R.-LALLI B. S.: Oscillation theorems for second order nonlinear functional differential equations with damping. Comput. Math. Appl. 25 (1993), 107-113. MR 1205426 | Zbl 0773.34051

[4] GRACE S. R.-HAMEDANL G. G.-LALLI B. S.: Oscillation of damped-forced functional differential equations. Dynam. Systems Appl. 4 (1995), 391-404. MR 1348507 | Zbl 0833.34063

[5] GRACE S. R.-LALLI B. S.: Oscillation theorems for second order delay and neutral difference equations. Utilitas Math. 45 (1994), 197-211. MR 1284030 | Zbl 0808.39005

[6] GRACE S. R.-LALLI B. S.: Oscillation theorems for forced neutral difference equations. J. Math. Anal. Appl. 187 (1994), 91-106. MR 1296607 | Zbl 0812.39002

[7] HOOKER J. W.-PATULA W. T.: A second order nonlinear difference equations: Oscillation and asymptotic behaviour. 3. Math. Anal. Appl. 91 (1983), 9-29. MR 0688528

[8] LADAS G.: Explicit conditions for the oscillation of difference equations. J. Math. Anal. Appl. 153 (1990), 276-287. MR 1080131 | Zbl 0718.39002

[9] PATULA W. T.: Growth and oscillation properties of second order linear difference equations. SIAM J. Math. Anal. 10 (1979), 55-61. MR 0516749 | Zbl 0397.39001

[10] PHILOS, CH. G.: On oscillation of some difference equations. Funkcial. Ekvac. 34 (1991), 157-172. MR 1116887