1. Bordeaux Montrieux, W.: Loi de Weyl presque sûre et résolvante pour des opérateurs différentiels non-autoadjoints. Thèse, CMLS, Ecole Polytechnique (2008)
2. Boulton, L.S.: Non-selfadjoint harmonic oscillator, compact semigroups and pseudospectra. J. Operator Theory 47(2), 413–429 (2002)
3. Cialdea, A., Maz'ya, V.: Criterion for the L p -dissipativity of second order differential operators with complex coefficients. J. Math. Pures Appl. IX Sér. 84, no. 8, 1067–1100 (2005)
4. Cialdea, A., Maz'ya, V.: Criteria for the L p -dissipativity of systems of second order differential equations. Ric. Mat. 55, no. 2, 233–265 (2006)
5. Davies, E.B.: Semi-classical states for non-selfadjoint Schrödinger operators. Commun. Math. Phys. 200, no. 1, 35–41 (1999)