1. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables,1972
2. Asymptotic Expansions;Copson,1965
3. Decision procedure for indefinite hypergeometric summation;Gosper;Proc. Natl. Acad. Sci. USA,1978
4. Sharp inequalities related to Gosper’s formula;Mortici;C. R. Math. Acad. Sci. Paris,2010
5. Very accurate approximations for the factorial function;Batir;J. Math. Inequal.,2010