MathSciNet bibliographic data MR1016163 11Y35 (11F11 33E05) Borwein, J. M.; Borwein, P. B. Approximating $\pi$$\pi$ with Ramanujan's modular equations. Constructive Function Theory—86 Conference (Edmonton, AB, 1986). Rocky Mountain J. Math. 19 (1989), no. 1, 93–102. Article

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