@article{MO_2022_1_a4,
     author = {V. V. Volchkov and Vit. V. Volchkov and N. P. Volchkova},
     title = {On some properties of functions},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {38--47},
     year = {2022},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2022_1_a4/}
}