Bastien, G. ., & Rogalski, M. . (2024). Difference equations on $\mathbb{R}_*^+$, of the form $u_{n+2}=\frac{f(u_{n+1})}{u_n+\lambda}$, $\lambda>0$, with applications to perturbations of dynamical systems. Sarajevo Journal of Mathematics, 18(1), 63–82. https://doi.org/10.5644/SJM.18.01.05