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Partially supported by NSF GP 369 92X at the Courant Institute of Mathematical Sciences, New York.
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Duistermaat, J.J., Sjöstrand, J. A global construction for pseudo-differential operators with non-involutive characteristics. Invent Math 20, 209–225 (1973). https://doi.org/10.1007/BF01394095
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DOI: https://doi.org/10.1007/BF01394095