@article{EMJ_2010_1_1_a6,
     author = {H. G. Ghazaryan and V. N. Margaryan},
     title = {On infinite differentiability of solutions of nonhomogeneous almost hypoelliptic equations},
     journal = {Eurasian mathematical journal},
     pages = {54--72},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2010_1_1_a6/}
}