1. L. Böttcher “The main laws of iteration convergence and its application to Analysis,” Izv. Fiz.-Mat. O-va. Imp. Kazan. Univ. 14, 155–234 (1903).
2. J. Ritt “On the iteration of rational functions,” Trans. Am. Math. Soc. 21, 348–356 (1920).
3. A. V. Holden Chaos (Princeton Univ. Press, Princeton, 2014).
4. Zh. Valiron, Analytic Functions (Gostekhizdat, Moscow, 1957) [in Russian].
5. M. I. Nechepurenko Real Functions Iterations and Functional Equations (Novosibirsk, 1997) [in Russian].