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@article{MV_1964_16_3_a15, author = {A. Makowski}, title = {On the equation $\varphi(x+m)=\varphi(x)+m$}, journal = {Matemati\v{c}ki vesnik}, pages = {246 }, publisher = {mathdoc}, volume = {16}, number = {3}, year = {1964}, url = {http://geodesic.mathdoc.fr/item/MV_1964_16_3_a15/} }
A. Makowski. On the equation $\varphi(x+m)=\varphi(x)+m$. Matematički vesnik, Tome 16 (1964) no. 3, p. 246 . http://geodesic.mathdoc.fr/item/MV_1964_16_3_a15/