@article{DM_2021_33_2_a7,
     author = {D. G. Meshchaninov},
     title = {Some families of closed classes in~$P_k$ defined by additive formulas},
     journal = {Diskretnaya Matematika},
     pages = {100--116},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2021_33_2_a7/}
}