@article{IVM_1965_4_a18,
     author = {V. P. Filippov},
     title = {Some theorems on non-separability of $B$-sets of lower classes},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {147--153},
     year = {1965},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1965_4_a18/}
}