1. Y. Domshlak, Does there exist a discrete version of Chanturia-Koplatadze Lemma (to appear).
2. Oscillations of delay difference equations with oscillating coefficients;Yu;J. Math. Anal. Appl.,1993
3. Oscillation of difference equations;Lalli,1993
4. Qualitative theory of partial difference equations (I): Oscillation of nonlinear partial difference equations;Cheng;Tamkang J. Math.,1994
5. Oscillation Theory of Delay Differential Equations;Györi,1991