@article{MZM_2021_110_3_a3,
     author = {V. S. Monakhov},
     title = {Three {Formations} over~$\mathfrak U$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {358--367},
     publisher = {mathdoc},
     volume = {110},
     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_110_3_a3/}
}