@article{CHEB_2023_24_1_a1,
     author = {K. V. Budiyanskaya and I. B. Kozhukhov},
     title = {Congruences of a free unar},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {15--26},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2023_24_1_a1/}
}