1. [1] A. Brown, A second order non-linear recurrence relation, Geoffrey T. Butler Memorial Conference on Differential Equations and Population Biology, June 20-25, 1988, University of Alberta, Edmonton, Canada.
2. [2] I. Gyori and G. Ladas, Linearized oscillations for equations with piecewise constant arguments, Differential and Integral Equation 2 (1989), 123-131.
3. [3] I. Gyori, G. Ladas, and L. Pakula, Conditions for the oscillation of difference equations with applications to equations with piecewise constants arguments, SIAM J. Math. Anal. 22 (1991), 769-773.
4. [4] G. Ladas, Recent development in the oscillation of delay difference equations, International Conference in Differential equations; Theory and Applications in Stability and Control, Colorado Springs, Colorado, June 7-10, 1989.
5. [5] G. Ladas, Explicit conditions for the oscillation of difference equations, J. Math. Anal. Appl. 153 (1990), 276-287.