@article{DAN_1968_179_4_a7,
     author = {M. D. Ramazanov},
     title = {A priori estimates of solutions of the {Dirichlet} problem for certain hypoelliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {783--785},
     publisher = {mathdoc},
     volume = {179},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_4_a7/}
}