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@article{AM2_1986__31_137139, author = {H.L. Vasudeva and J.C. Parnami}, title = {A comparative study of functional equations characterising sine and cosine.}, journal = {Aequationes mathematicae}, pages = {26--33}, publisher = {mathdoc}, volume = {31}, year = {1986}, zbl = {0607.39004}, url = {http://geodesic.mathdoc.fr/item/AM2_1986__31_137139/} }
H.L. Vasudeva; J.C. Parnami. A comparative study of functional equations characterising sine and cosine.. Aequationes mathematicae, Tome 31 (1986), pp. 26-33. http://geodesic.mathdoc.fr/item/AM2_1986__31_137139/