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Le premier auteur a bénéficié du “N.S.F. Grant 35 825”.
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Baouendi, M.S., Sjöstrand, J. Régularité analytique pour des opérateurs elliptiques singuliers en un point. Ark. Mat. 14, 9–33 (1976). https://doi.org/10.1007/BF02385820
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DOI: https://doi.org/10.1007/BF02385820