@article{PDM_2024_4_a2,
     author = {E. V. Kaygorodov},
     title = {Periodic multiplicative arithmetic functions},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {30--35},
     publisher = {mathdoc},
     number = {4},
     year = {2024},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2024_4_a2/}
}