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"Wallis-Ramanujan-Schur-Feynman."
Tewodros Amdeberhan et al. (2010)
- Tewodros Amdeberhan, Olivier Espinosa, Victor H. Moll, Armin Straub:
Wallis-Ramanujan-Schur-Feynman. Am. Math. Mon. 117(7): 618-632 (2010)
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