1. On some problems of the theory of differential equations with deviating argument;Mishkis;UMN,1977
2. Periodicity of solutions of certain recursions involving the maximum function;Barbeau;J. Diff. Eqns. and Appls.,1996
3. On the nonautonomous difference equation xn+1 = max{xn, An/(xnxn−1);Briden,2000
4. On the difference equation xn+1 = max{xn, An}/(xn2xn−1;Cunningham,2000