@article{1183419152,
author = {Peirce, George},
title = {A new approximate construction for $\pi$},
journal = {Bull. Amer. Math. Soc.},
volume = {14},
number = {3},
year = {1907},
pages = { 166-167},
language = {en},
url = {http://dml.mathdoc.fr/item/1183419152}
}
Peirce, George. A new approximate construction for $\pi$. Bull. Amer. Math. Soc., Tome 14 (1907) no. 3, pp. 166-167. http://gdmltest.u-ga.fr/item/1183419152/