@article{GDZPPN002035006,
title = {A proof of Euler's identity by a functional equation.},
journal = {Aequationes mathematicae},
volume = {28},
year = {1985},
pages = {138-143},
zbl = {0561.30019},
url = {http://dml.mathdoc.fr/item/GDZPPN002035006}
}
Haruki, Hiroshi. A proof of Euler's identity by a functional equation.. Aequationes mathematicae, Tome 28 (1985) pp. 138-143. http://gdmltest.u-ga.fr/item/GDZPPN002035006/