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Supported in part by NSF Grant GP-27176 at Courant Institute, New York University, NSF Grant GP-7952X2 at the Institute for Advanced Study, Princeton, and AFOSR contract F44620-69-C-0106 at Stanford University.
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Duistermaat, J.J., Hörmander, L. Fourier integral operators. II. Acta Math. 128, 183–269 (1972). https://doi.org/10.1007/BF02392165
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DOI: https://doi.org/10.1007/BF02392165