@article{DAN_1977_233_3_a6,
     author = {M. I. Kanovitch},
     title = {Complex properties of context-sensitive languages},
     journal = {Doklady Akademii Nauk},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {233},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_3_a6/}
}