On the equation $\varphi(z)=\varphi_1(x)+\varphi_2(x)+\varphi_3(x+y)$
Doklady Akademii Nauk, Tome 210 (1973) no. 4, pp. 753-755
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@article{DAN_1973_210_4_a0,
author = {J. I. Bogoljubov},
title = {On the equation $\varphi(z)=\varphi_1(x)+\varphi_2(x)+\varphi_3(x+y)$},
journal = {Doklady Akademii Nauk},
pages = {753--755},
year = {1973},
volume = {210},
number = {4},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1973_210_4_a0/}
}
J. I. Bogoljubov. On the equation $\varphi(z)=\varphi_1(x)+\varphi_2(x)+\varphi_3(x+y)$. Doklady Akademii Nauk, Tome 210 (1973) no. 4, pp. 753-755. http://geodesic.mathdoc.fr/item/DAN_1973_210_4_a0/