@article{SM_1969_8_2_a3,
author = {E. V. Radkevich},
title = {Hypoelliptic operators with multiple characteristics},
journal = {Sbornik. Mathematics},
pages = {181--205},
year = {1969},
volume = {8},
number = {2},
language = {en},
url = {http://geodesic.mathdoc.fr/item/SM_1969_8_2_a3/}
}
E. V. Radkevich. Hypoelliptic operators with multiple characteristics. Sbornik. Mathematics, Tome 8 (1969) no. 2, pp. 181-205. http://geodesic.mathdoc.fr/item/SM_1969_8_2_a3/
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