@article{MZM_2021_109_1_a4,
     author = {P. S. Gevorgyan and A. A. Nazaryan},
     title = {On {Orbits} and {Bi-invariant} {Subsets} of {Binary} $G${-Spaces}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {47--56},
     publisher = {mathdoc},
     volume = {109},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_109_1_a4/}
}