On the functional equation $f(x+y-xy) + f(xy) = f(x) + f(y)$
Matematički vesnik, Tome 20 (1968) no. 2, p. 177 .

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Classification : 39B22
@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/}
}
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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/