%0 Journal Article %A A. V. Nechesov %T Some questions on polynomially computable representations for generating grammars and Backus-Naur forms %J Matematičeskie trudy %D 2022 %P 134-151 %V 25 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MT_2022_25_1_a5/ %G ru %F MT_2022_25_1_a5