@article{VSGU_2014_10_a10,
     author = {V. P. Tsvetov},
     title = {On a superclass of {A-grammars}},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {102--108},
     year = {2014},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2014_10_a10/}
}