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On the eigenvalues of a class of hypoelliptic operators. (English) Zbl 0375.35014

MSC:
35H10 Hypoelliptic equations
35P20 Asymptotic distributions of eigenvalues in context of PDEs
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[10] Melin, A., Sj?strand, J.: Fourier integral operators with complex-valued phase functions. Lecture Notes in Mathematics 459, pp. 120-233. Berlin, Heidelberg, New York: Springer 1975 · Zbl 0306.42007
[11] Melin, A., Sj?strand, J.: Fourier integral operators with complex phase functions and a parametrix for an interior boundary value problem. Comm. P.D.E.1, 313-400 (1976) · Zbl 0364.35049
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[13] Sj?strand, J.: Parametrices for pseudodifferential operators with multiple characteristics. Arkiv f?r Mat.12, 85-130 (1974) · Zbl 0317.35076
[14] Sj?strand, J.: Applications of Fourier distributions with complex phase function. Lecture Notes in Mathematics 459, 255-282. Berlin, Heidelberg, New York: Springer 1975
[15] Treves, F.: Solution of Cauchy problems modulo flat functions. Comm. P.D.E.1, 45-72 (1976)
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