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@article{PIM_1962_N_S_02_16_a12, author = {Svetozar Kurepa}, title = {On {The} {Functional} {Equation:} {T1(t+s)} {T2(t-s)} = {T3(t)} {T4(s)}}, journal = {Publications de l'Institut Math\'ematique}, pages = {99 }, publisher = {mathdoc}, volume = {_N_S_02}, number = {16}, year = {1962}, url = {http://geodesic.mathdoc.fr/item/PIM_1962_N_S_02_16_a12/} }
Svetozar Kurepa. On The Functional Equation: T1(t+s) T2(t-s) = T3(t) T4(s). Publications de l'Institut Mathématique, _N_S_02 (1962) no. 16, p. 99 . http://geodesic.mathdoc.fr/item/PIM_1962_N_S_02_16_a12/