1. [1] A. A. Gol’dberg, I. V. Ostrovskii, The disribution of values of meromorphic function, Nauka, Moscow, 1970.
2. [2] G. G. Gunderson, Meromorphic functions that share three or four values, London Math. Soc, 20, 457-466, 1979.
3. [3] Daochun S, Zongsheng G, Value disribution theory of algebroid functions, Beijing: Science Press; 2014.
4. [4] Yu-Zan He and Xiu-Zhi Xiao, Algebroid functions and Ordinarry Difference Equations, Beijing; Science Press, 1988.
5. [5] Hongxun Y. On the multiple values and uniqueness of algebroid functions, Eng.Math.; 8(1991), 1-8.