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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}, publisher = {mathdoc}, volume = {210}, number = {4}, year = {1973}, 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/