Grove, E. A. and Ladas, G. (2002) “Periodicity in Nonlinear Difference Equations”, CUBO, A Mathematical Journal, 4(1), pp. 192–227. Available at: https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1731 (Accessed: 20 May 2024).