[1] Jarczyk W. On an equation of linear iteration. Aequationes Math, 1996, 51: 303-310

[2] Jarczyk W. Series of iterates summing up to identity function. Grazer Math Ber, 1997, 334: 153-162

[3] Kulczycki M, Tabor J. Iterative functional equations in the class of Lipschitz functions. Aequationes Math,

2002, 64: 24-33

[4] Mai J H, Liu X H. Existence, uniqueness and stability of Cm solutions of iterative functional equations.

Sci China, 2000, 43A(9): 897-913

[5] Matkowski J, Zhang W N. On linear dependence of iterates. J Appl Anal, 2000, 6(1): 149-152

[6] Wang X P, Si J G. Differentiable solutions of an iterative functional equation. Aequationes Math, 2001,

61: 79-96

[7] Zhang W N. Discussion on the iterated equation Pni=1_ifi(x) = F(x). Chin Sci Bul, 1987, 32(21):1444-1451

[8] Zhang W N. Stability of the solution of the iterated equationPni=1_ifi(x) = F(x). Acta Math Sci, 1988,

8(4): 421-424

[9] Zhang W N. Discussion on the differentiable solutions of the iterated equation Pni=1ifi(x) = F(x).

Nonlinear Anal, 1990, 15(4): 387-398

[10] Zhang W N, John A. Baker. Continuous solutions of a polynomial-like iterative equation with variable

coefficients. Ann Polon Math, 2000, 73: 29-36

[11] Zhang W N. Solutions of equivariance for a polynomial-like iterative equation. Proc Royal Soc Edinburgh,

2000, 130A(5): 1153-1163