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2. Ramanujan's Notebooks Part IV;Berndt,1994
3. Factorial ratios, hypergeometric series, and a family of step functions;Bober;J. Lond. Math. Soc. (2),2009
4. Pi and the AGM: A Study in Analytic Number Theory and Computational Complexity;Borwein,1987
5. A WZ proof of Ramanujan's formula for π;Ekhad,1994