@article{IVM_1969_6_a12,
     author = {V. Ya. Shvarts},
     title = {A~class of positional operatives},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {98--105},
     year = {1969},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_6_a12/}
}