The functional equation F(ax) + F(bx+a) = F(bx) + F(ax+b), entire and almost periodic solutions.
Journal für die reine und angewandte Mathematik, Tome 302 (1978), pp. 116-136.

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@article{JRAM_1978__302_152041,
     author = {John V. Ryff},
     title = {The functional equation {F(ax)} + {F(bx+a)} = {F(bx)} + {F(ax+b),} entire and almost periodic solutions.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {116--136},
     publisher = {mathdoc},
     volume = {302},
     year = {1978},
     zbl = {0376.39003},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__302_152041/}
}
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John V. Ryff. The functional equation F(ax) + F(bx+a) = F(bx) + F(ax+b), entire and almost periodic solutions.. Journal für die reine und angewandte Mathematik, Tome 302 (1978), pp. 116-136. http://geodesic.mathdoc.fr/item/JRAM_1978__302_152041/