MathSciNet bibliographic data MR968148 30D05 (33A25) Borwein, J. M.; Borwein, P. B. On the mean iteration $(a,b)\leftarrow ((a+3b)/4,(\sqrt{ab}+b)/2)$$(a,b)\leftarrow ((a+3b)/4,(\sqrt{ab}+b)/2)$. Math. Comp. 53 (1989), no. 187, 311–326. Article

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