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@article{PORMA_1976__35_2_115278, author = {Haruki, Hiroshi}, title = {A functional equation connected with the sine addition theorem}, journal = {Portugaliae mathematica}, pages = {75--79}, publisher = {mathdoc}, volume = {35}, number = {2}, year = {1976}, mrnumber = {0442527}, zbl = {0415.39003}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1976__35_2_115278/} }
Haruki, Hiroshi. A functional equation connected with the sine addition theorem. Portugaliae mathematica, Tome 35 (1976) no. 2, pp. 75-79. http://geodesic.mathdoc.fr/item/PORMA_1976__35_2_115278/