1. On the periodicity of the difference equation xn+1=α|xn|+βxn−1;Abu-Sarris;J. Difference Equ. Appl.,1999
2. Characterization of rational periodic sequences;Abu-Sarris;J. Difference Equ. Appl.,2000
3. On periodic solutions of first order linear difference equations;Agarwal;Math. Comput. Modelling,1995
4. Periodic solutions of the generalized Lyness recursion;Barbeau;J. Difference Equ. Appl.,1995
5. E. Janowski, V. Kocic, G. Ladas, S. Schults, Global behavior of solutions of xn+1=max{xn,A}/xn−1,, in: S. Elaydi, J. Greaf, G. Ladas, A. Petterson (Eds.), Proc. of the First ICDEA, 1995, pp. 273–282