@article{TM_1973_133_a9,
     author = {A. V. Gladkii},
     title = {Mathematical methods for studying natural languages},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {95--108},
     publisher = {mathdoc},
     volume = {133},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1973_133_a9/}
}