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Wrench, J.W. (1938) On the Derivation of Arctangent Equalities. American Mathematical Monthly, 45, 108-109.
https://doi.org/10.2307/2304280

has been cited by the following article:

• TITLE: A Method to Reduce the Lehmer Measure in a Multi-Term Machin-Like Formula for π

  AUTHORS: Sanjar M. Abrarov, Rehan Siddiqui, Rajinder K. Jagpal, Brendan M. Quine

  KEYWORDS: Constant Pi, Machin-Like Formula, Lehmer’s Measure

  JOURNAL NAME: Open Journal of Applied Sciences, Vol.12 No.8, August 31, 2022

  ABSTRACT: Previously we have proposed a new method of transforming quotients into integer reciprocals in the Machin-like formulas for π. As a further development, here we show how to generate a multi-term Machin-like formula for π with a reduced Lehmer measure. The Mathematica codes validating these results are presented.