@article{SM_1968_4_3_a5,
     author = {L. R. Volevich and S. G. Gindikin},
     title = {On a class of hypoelliptic polynomials},
     journal = {Sbornik. Mathematics},
     pages = {369--383},
     year = {1968},
     volume = {4},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1968_4_3_a5/}
}