MathSciNet bibliographic data MR2050038 (2006c:33001) 33B10 (26D07 33B20) Alzer, Horst On Ramanujan's inequalities for \$\exp(k)\$$\exp(k)$. J. London Math. Soc. (2) 69 (2004), no. 3, 639–656. Article

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