@article{1183485523,
author = {Ettlinger, H. J.},
title = {An elementary proof of a fundamental lemma concerning the limit of a sum},
journal = {Bull. Amer. Math. Soc.},
volume = {29},
number = {10},
year = {1923},
pages = { 219-223},
language = {en},
url = {http://dml.mathdoc.fr/item/1183485523}
}
Ettlinger, H. J. An elementary proof of a fundamental lemma concerning the limit of a sum. Bull. Amer. Math. Soc., Tome 29 (1923) no. 10, pp. 219-223. http://gdmltest.u-ga.fr/item/1183485523/