@article{GDZPPN002025396, title = {On the Cosine-Sine Operator Functional Equations}, journal = {Aequationes mathematicae}, volume = {7}, year = {1971}, pages = {231-234}, zbl = {0232.47044}, url = {http://dml.mathdoc.fr/item/GDZPPN002025396} }
BUCHE, A.B. On the Cosine-Sine Operator Functional Equations. Aequationes mathematicae, Tome 7 (1971) pp. 231-234. http://gdmltest.u-ga.fr/item/GDZPPN002025396/