Amour L.
Determination Of a Third Order Operator From Two Of Its Spectra
(48K, Latex 2e)

ABSTRACT.  We consider a complex third order differential operator
 on a bounded interval
with boundary conditions presenting
a mixed aspect of the  Dirichlet and the periodic problems.
It is proved that two spectra are  sufficient to determine
the operator. This result is valid under readily
verifiable hypotheses applying
simultaneously to the two spectra.