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@article{AM2_1985__28_137051, author = {Hiroshi Haruki}, title = {A proof of {Euler's} identity by a functional equation.}, journal = {Aequationes mathematicae}, pages = {138--143}, publisher = {mathdoc}, volume = {28}, year = {1985}, zbl = {0561.30019}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137051/} }
Hiroshi Haruki. A proof of Euler's identity by a functional equation.. Aequationes mathematicae, Tome 28 (1985), pp. 138-143. http://geodesic.mathdoc.fr/item/AM2_1985__28_137051/