[1] R.P. Agarwal: Difference Equations and Inequalities. Marcel Dekker, New York, 1992. MR 1155840 | Zbl 0925.39001

[2] S.R. Grace and B.S. Lalli: Oscillation theorems for certain second order perturbed nonlinear differential equations. J. Math. Anal. Appl. 77 (1980), 205–214. DOI 10.1016/0022-247X(80)90270-X | MR 0591271

[3] J.R. Graef, S.M. Rankin and P.W. Spikes: Oscillation theorems for perturbed nonlinear differential equations. J. Math. Anal. Appl. 65 (1978), 375–390. DOI 10.1016/0022-247X(78)90189-0 | MR 0506315

[4] J.W. Hooker and W.T. Patula: A second order nonlinear difference equation: Oscillation and asymptotic behavior. J. Math. Anal. Appl. 91 (1983), 9–29. DOI 10.1016/0022-247X(83)90088-4 | MR 0688528

[5] M.R.S. Kulenovic and M. Budincevic: Asymptotic analysis of nonlinear second order difference equation. An. Stin. Univ. Iasi 30 (1984), 39–52. MR 0800139

[6] J. Popenda: Oscillation and nonoscillation theorems for second order difference equations. J. Math. Anal. Appl. 123 (1987), 34–38. DOI 10.1016/0022-247X(87)90291-5 | MR 0881528 | Zbl 0612.39002

[7] B. Szmanda: Nonoscillation, oscillation and growth of solutions of nonlinear difference equations of second order. J. Math. Anal. Appl. 109 (1985), 22–30. DOI 10.1016/0022-247X(85)90174-X | MR 0796040 | Zbl 0589.39003

[8] B. Szmanda: Oscillation theorems for nonlinear second order difference equations. J. Math. Anal. Appl. 79 (1981), 90–95. DOI 10.1016/0022-247X(81)90011-1 | MR 0603378 | Zbl 0455.39004

[9] E. Thandapani: Oscillation theorems for perturbed nonlinear second order difference equations. J. Computers and Mathematics,  (to appear). MR 1284245 | Zbl 0807.39002

[10] E. Thandapani: Oscillatory behavior of solutions of second order nonlinear difference equations. J. Math. Phy. Sci. 25 (1991), 457–464.

[11] E. Thandapani: Oscillation theorems for second order damped nonlinear difference equations. Czech J. Math (to appear). MR 1331469 | Zbl 0838.39003

[12] E. Thandapani: Oscillation criteria for certain second order difference equations. ZAA 11 (1992), 425–429. MR 1266155 | Zbl 0787.39002

[13] E. Thandapani and S. Pandian: On the oscillatory behavior of solutions of second order nonlinear difference equations. ZAA 13 (1994), 347–358. MR 1287156

[14] C.C. Yeh: Oscillation criteria for second order nonlinear perturbed differential equations. J. Math. Anal. Appl. 138 (1989), 157–165. DOI 10.1016/0022-247X(89)90326-0 | MR 0988326 | Zbl 0668.34038