Sergei Naboko and Roman Romanov
Spectral Singularities and Asymptotics of Contractive Semigroups. I.
(66K, LaTeX 2e)

ABSTRACT.  The problem of localization of spectral singularities of 
dissipative operators in terms of the asymptotic of the 
corresponding exponential function is studied. We give a solution 
to this problem for the singularities of higher orders in the 
frame of the perturbation theory.