On spectral proporties of elliptic pseudo-differentiel operators far from selfadjoint ones, Zeitschrift für Analysis unt ihre Anwendungen, Bd, vol.8, issue.3, pp.237-260, 1989. ,
Nonanalytic-hypoellipticity for some degenerate elliptic operators, Bulletin of the American Mathematical Society, vol.78, issue.3, pp.483-486, 1972. ,
DOI : 10.1090/S0002-9904-1972-12955-0
A general calculus of pseudo-differential operators, Duke Math, J, pp.1-42, 1977. ,
Spectral Theory of self-adjoint operators in Hilbert space, 1986. ,
DOI : 10.1007/978-94-009-4586-9
Bibliographie Uniform semiclassical estimates for the propagation of quantum observables, Duke Math, J, vol.111, issue.2, pp.223-252, 2002. ,
Nonlinear eigenvalues and analytic hypoellipticity, Journal of Functional Analysis, vol.209, issue.2, pp.425-443, 2004. ,
DOI : 10.1016/S0022-1236(03)00105-8
Nonlinear eigenvalue problems, Acta Mathematica, vol.121, issue.0, pp.77-128, 1968. ,
DOI : 10.1007/BF02391910
Remarques sur des résultats de G. Métivier sur la non-hypo-analyticité, pp.1978-1979 ,
Semiclassical Analysis of nonlinear eigenvalue problem and non analytic hypoellipticity, 2003. ,
Semiclassical analysis of a nonlinear eigenvalue problem and nonanalytic hypoellipticity, St. Petersburg Mathematical Journal, vol.16, issue.01, pp.285-296, 2005. ,
DOI : 10.1090/S1061-0022-04-00851-9
Krein : Introduction à la théorie des opérateurs linéaires non autoadjoints, 1972. ,
On some mathematical principles in the linear theory of damped oscillations of continua I, Integral Equations and operators Theory, pp.364-399, 1978. ,
Equation des Ondes Amorties, Séminaire Équations aux partielles (Polytechnique), pp.1-14, 1993. ,
DOI : 10.1007/978-94-017-0693-3_4
Introduction to the spectral theory of polynomial operator pencils Translation of mathematical monographs ,
Non linear eigenvalue problems, Matemàtica Contemporanea, vol.26, pp.109-127, 2004. ,
URL : https://hal.archives-ouvertes.fr/hal-00003472
Non linear eigen value problems with small parameter, Integral Equations and Operators Theory, pp.231-240, 1984. ,
Complex power of an elliptic operator, Singular integrals, Proc. Symposia Pure Math, pp.288-307, 1967. ,