1. Oscillation of discrete analogues of delay equations;Erbe;Diff. and Integral Equations,1989
2. Oscillation of neutral difference equations with variable coefficients;Georgiou,1991
3. Oscillation of neutral difference equations with variable coefficients;Georgiou;Proc. of the Conference in Colorado Springs,1989
4. Oscillation Theory of Delay Differential Equations with Applications;Györi,1991
5. Global attractivity in delay difference equation;Gyori;Nonlinear Analysis,1991