@article{IM2_1989_33_1_a8,
     author = {A. I. Budkin},
     title = {On~filters in the lattice of quasivarieties of groups},
     journal = {Izvestiya. Mathematics },
     pages = {201--207},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_33_1_a8/}
}