@article{RM_1960_15_4_a19,
     author = {P. P. Mosolov},
     title = {A boundary-value problem for hypoelliptic operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1960},
     volume = {15},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_4_a19/}
}