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@article{MV_1968_20_2_a5, author = {H. Swiatak}, title = {On the functional equation $f(x+y-xy) + f(xy) = f(x) + f(y)$}, journal = {Matemati\v{c}ki vesnik}, pages = {177 }, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/MV_1968_20_2_a5/} }
H. Swiatak. On the functional equation $f(x+y-xy) + f(xy) = f(x) + f(y)$. Matematički vesnik, Tome 20 (1968) no. 2, p. 177 . http://geodesic.mathdoc.fr/item/MV_1968_20_2_a5/