Geodesic
A simple proof of the Beloshapka theorem on the parametrization of the automorphism group of a CR manifold
Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 939-942 
V. V. Ezhov; G. Schmalz. A simple proof of the Beloshapka theorem on the parametrization of the automorphism group of a CR manifold. Matematičeskie zametki, Tome 61 (1997) no. 6, pp. 939-942. http://geodesic.mathdoc.fr/item/MZM_1997_61_6_a14/
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     title = {A simple proof of the {Beloshapka} theorem on the parametrization of the automorphism group of a {CR} manifold},
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[2] Chern S. S., Moser J. K., Acta Math., 133:3–4 (1974), 219–271 | DOI | MR

[3] Palamodov V. P., Lineinye differentsialnye operatory s postoyannymi koeffitsientami, Nauka, M., 1967

[4] Beloshapka V. K., Matem. sb., 182:2 (1991), 203–219 | MR | Zbl