1. R. Apéry, Sur une équation diophantienne, C.R. Acad. Sci. Paris, Ser. A. 251(1960), 1451-1452.
2. Y. Bugeaud and T. N. Shorey, On the number of solutions of the generalized Ramanujan-Nagell equation, J. Reine Angew. Math. 539 (2001), 55-74.
3. L. K. Hua, Introduction to number theory, Berlin: Springer Verlag, 1982.
4. M. H. Le, Applications of the Gel’fond-baker method to diophantine equations, Beijing: Science Press, 1998. (in Chinese)
5. M. H. Le and G. Soydan. A brief survey on the generalized Lebesque-Ramanujan-Nagell equation, Surv. Math. Appl., 12(2020), 473-523.