@article{IVM_1991_6_a0,
     author = {V. K. Bulitko},
     title = {On $1/n$-hereditary sets},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--11},
     year = {1991},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_6_a0/}
}