Oscillation of solutions of second order difference equations Szmanda, B. — 1978 Portugaliae mathematica
Oscillation of solutions of second order difference equations. B. Szmanda — 1980 Publications de l'Institut Mathématique [Elektronische Ressource]
Oscillation Of solutions Of Second Order Difference Equations B. Szmanda — 1980 Publications de l'Institut Mathématique
Oscillatory and Asymptotic Behaviour of Some Difference Equations A. Sternal; Z. Szafranski; B. Szmanda — 1998 Publications de l'Institut Mathématique