@article{DAN_1963_149_6_a3,
     author = {V. P. Mikhailov},
     title = {The first boundary-value problem for certain semi-bounded hypo-elliptic differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {1257--1260},
     publisher = {mathdoc},
     volume = {149},
     number = {6},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_6_a3/}
}