1. M. Abramowitz and I. Stegun, Handbook of Mathematical Functions, Dover, N.Y., 1964.
2. M. D. Atkinson, How to compute the series expansions of sec x and tan x, Amer. Math. Monthly, 93 (1986) 387-388.
3. B. C. Berndt, Character analogues of the Poisson and Euler-MacLaurin summation formulas with applications, J. Number Theory, 7 (1975 413-445.
4. J. M. Borwein and P. B. Borwein, Pi and the AGM - A Study in Analytic Number Theory and Computational Complexity, Wiley, N.Y., 1987.
5. T. J. I’a Bromwich, An Introduction to the Theory of Infinite Series, 2nd ed., MacMillan, London, 1926.