@article{INTV_1975_12_a2,
     author = {A. N. Maslov and \`E. D. Stotskii},
     title = {Classes of formal grammars},
     journal = {Itogi nauki i tehniki. Seri\^a, Teori\^a vero\^atnostej. Matemati\v{c}eska\^a statistika. Teoreti\v{c}eska\^a kibernetika},
     pages = {155--187},
     publisher = {mathdoc},
     volume = {12},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTV_1975_12_a2/}
}