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The work of L. Boutet de Monvel was partly supported by an NSF Visiting Senior Foreign Fellowship, while that of F. Trèves was partly supported by NSF Grant No. 27671.
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de Monvel, L.B., Trèves, F. On a class of pseudodifferential operators with double characteristics. Invent Math 24, 1–34 (1974). https://doi.org/10.1007/BF01418785
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DOI: https://doi.org/10.1007/BF01418785