@article{MT_1988_10_a7,
     author = {A. D. Korshunov},
     title = {The power and structure of closed {Post} classes (families of subsets of a finite set)},
     journal = {Matemati\v{c}eskie trudy},
     pages = {159--204},
     publisher = {mathdoc},
     volume = {10},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1988_10_a7/}
}