1. L.V. Ahlfors, Complex Analysis, Third Ed., McGraw-Hill, New York, 1979.
2. N.I. Akhiezer, Elements of the Theory of Elliptic Functions, Izdat. “Nauka,” Moscow, 1970 [in Russian]; English transi., American Mathematical Society, Providence, RI, 1990.
3. G. Almkvist and B. Berndt, Gauss, Landen, Ramanujan, the arithmetic-geometric mean, ellipses, π, and the Ladies Dairy, Am. Math. Monthly
95 (1988), 585–608.
4. J.M. Borwein and P.B. Borwein, Pi and the AGM, John Wiley and Sons, New York, 1987.
5. J.M. Borwein, P.B. Borwein, and D.H. Bailey, Ramanujan, modular equations, and approximations to pi or how to compute one billion digits of pi, Am. Math. Monthly
96 (1989), 201–219.