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@article{AM2_1990__40_1_137378, author = {H. Haruki}, title = {A new {Pythagorean} functional equation.}, journal = {Aequationes mathematicae}, pages = {271--280}, publisher = {mathdoc}, volume = {40}, number = {1}, year = {1990}, zbl = {0722.30012}, url = {http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137378/} }
H. Haruki. A new Pythagorean functional equation.. Aequationes mathematicae, Tome 40 (1990) no. 1, pp. 271-280. http://geodesic.mathdoc.fr/item/AM2_1990__40_1_137378/