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@article{MOMA_1960__64_177105, author = {Svetozar Kurepa}, title = {Functional {Equation} {F(x+y)} {F(x-y)} = {F2(x)} {-F2(y)} in n-dimensional {Vector} {Space.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {321--329}, publisher = {mathdoc}, volume = {64}, year = {1960}, zbl = {0097.32003}, url = {http://geodesic.mathdoc.fr/item/MOMA_1960__64_177105/} }
Svetozar Kurepa. Functional Equation F(x+y) F(x-y) = F2(x) -F2(y) in n-dimensional Vector Space.. Monatshefte für Mathematik, Tome 64 (1960), pp. 321-329. http://geodesic.mathdoc.fr/item/MOMA_1960__64_177105/