@article{1255631812,
author = {Estermann, T.},
title = {Another proof that bounded modular functions are constants},
journal = {Illinois J. Math.},
volume = {6},
number = {1},
year = {1962},
pages = { 128-130},
language = {en},
url = {http://dml.mathdoc.fr/item/1255631812}
}
Estermann, T. Another proof that bounded modular functions are constants. Illinois J. Math., Tome 6 (1962) no. 1, pp. 128-130. http://gdmltest.u-ga.fr/item/1255631812/