@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/