@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/}
}