Annales Polonici Mathematici > 1998 > 70 > 1 > 117-129
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journal ISSN : | 0066-2216 |
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Bibliography
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[BG] M. S. Baouendi and C. Goulaouic, Nonanalytic-hypoellipticity for some degenerate elliptic operators, Bull. Amer. Math. Soc. 78 (1972), 483-486.
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[BM] D. R. Bell and S. A. Mohammed, An extension of Hörmander's theorem for infinitely degenerate second-order operators, Duke Math. J. 78 (1995), 453-475.
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[BT] L. Boutet de Monvel and F. Treves, On a class of pseudo-differential operators with double characteristics, Invent. Math. 24 (1974), 1-34.