@article{1256046720,
author = {Elliott, P. D. T. A.},
title = {The exponential function characterized by an approximate functional equation},
journal = {Illinois J. Math.},
volume = {26},
number = {4},
year = {1982},
pages = { 503-518},
language = {en},
url = {http://dml.mathdoc.fr/item/1256046720}
}
Elliott, P. D. T. A. The exponential function characterized by an approximate functional equation. Illinois J. Math., Tome 26 (1982) no. 4, pp. 503-518. http://gdmltest.u-ga.fr/item/1256046720/