@article{VMJ_2020_22_3_a3,
     author = {A. M. Gaisin and G. A. Gaisina},
     title = {Ritt{\textendash}Sugimura type theorems},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {47--57},
     year = {2020},
     volume = {22},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2020_22_3_a3/}
}