@article{MT_2022_25_1_a5,
     author = {A. V. Nechesov},
     title = {Some questions on polynomially computable representations for generating grammars and {Backus-Naur} forms},
     journal = {Matemati\v{c}eskie trudy},
     pages = {134--151},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2022_25_1_a5/}
}