@article{SM_1982_43_4_a6,
     author = {V. N. Margaryan and G. G. Kazaryan},
     title = {On the functional dimension of the solution space of hypoelliptic equations},
     journal = {Sbornik. Mathematics},
     pages = {547--562},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_43_4_a6/}
}