Martinez A., Sordoni V.
Microlocal WKB Expansions
(92K, LATeX 2e)

ABSTRACT.  In this paper,  we  investigate the
existence of microlocal WKB expansions for the eigenfunctions of
pseudodifferential operators whose symbol admits a non
degenerate minimum at some point $(x_0,\xi_0)$ of ${\R}^{2n}$.
This is the case, for example, of   an  electromagnetic Schr\"odinger
operators
when the  electric potential
admits a non degenerate minimum at some point $x_0$.