@article{SEMR_2020_17_a61,
     author = {V. I. Rodionov},
     title = {On recursion relations in the problem of enumeration of posets},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {190--207},
     publisher = {mathdoc},
     volume = {17},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2020_17_a61/}
}