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This research was accomplished with the financial support of the Russian Foundation for Fundamental Research, Grant No. 93-011-225.
Translated from Matematicheskie Zametki, Vol. 55, No. 5, pp. 3–12, May, 1994.
The author is grateful to A. G. Vitushkin for valuable joint discussions while preparing the paper. This work was started while the author was staying at Ruhr University (Bochum).
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Beloshapka, V.K. Geometric invariants of aCR-manifold. Math Notes 55, 439–445 (1994). https://doi.org/10.1007/BF02110369
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DOI: https://doi.org/10.1007/BF02110369