@article{TM_1987_180_a70,
     author = {G. G. Kazaryan},
     title = {On hypoellipticity weight for a~class of regular operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {125--127},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1987_180_a70/}
}