Propagation des singularites des solutions d'equations analogues a l'equation de Schr�dinger.- On the spectrum of positive elliptic operators and periodic bicharacteristics.- Clean intersection theory and Fourier Integrals.- Non-uniqueness for the Cauchy Problem.- Solutions asymptotiques et groupe symplectique.- Le polynome de Bernstein d'une singularite isolee.- Fourier integral operators with complex-valued phase functions.- On a problem of Hans Lewy.- On structures of L2-well-posed mixed problems for hyperbolic operators.- Applications of fourier distributions with complex phase functions.- Second-order fuchsian elliptic equations and eigenvalue asymptotics.- On Maslov's quantization condition.

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Fourier Integral Operators and Partial Differential Equations: Colloque International, Universite de Nice, 1974 (Lecture Notes in Mathematics, 459)

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