@article{VTPMK_2021_3_a1,
     author = {B. N. Karlov},
     title = {On elementary equivalence of some unoids and unoids of their subsets},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {18--32},
     publisher = {mathdoc},
     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2021_3_a1/}
}