1. Adamović, D.: Problem 194. Mat. Vesnik 22(2), 270 (1970)
2. Adamović, D.: Solution to problem 194. Mat. Vesnik 23, 236–242 (1971)
3. Andruch-Sobilo, A., Migda, M.: On the rational recursive sequence $$x_{n+1}=ax_{n-1}/(b+cx_nx_{n-1}),$$ Tatra Mt. Math. Publ. 43, 1–9 (2009)
4. Bajo, I., Liz, E.: Global behaviour of a second-order nonlinear difference equation. J. Differ. Equat. Appl. 17(10), 1471–1486 (2011)
5. Bashmakov, M. I., Bekker, B. M., Gol’hovoi, V. M.: Zadachi po Matematike. Algebra and Analiz. Nauka, Moskva, (1982). (in Russian)