@article{GDZPPN002023849, title = {A Sine Functional Equation.}, journal = {Aequationes mathematicae}, volume = {5}, year = {1970}, pages = {56-62}, zbl = {0194.17303}, url = {http://dml.mathdoc.fr/item/GDZPPN002023849} }
Baker, J.A. A Sine Functional Equation.. Aequationes mathematicae, Tome 5 (1970) pp. 56-62. http://gdmltest.u-ga.fr/item/GDZPPN002023849/