1. S. Agmon, Spectral properties of Schrödinger operators and scattering theory, Ann. Scuola Norm. Sup. Pisa 2 (1975), 151–218.
2. E. Balslev and B. Helffer, Limiting absorption principle and resonances for the Dirac operator, Advances in applied mathematics, (1992), 13, (2), 186–215.
3. M. Ben-Artzi, Unitary equivalence and scattering theory for Stark-like Hamiltonians, J. Math. Phys. 25 (1984), 951–964.
4. M. Ben-Artzi, Regularity and smoothing for some equations of evolution, in “Nonlinear Partial Differential Equations and Their Applications,” H. Brezis, J. L. Lions (Eds.), Vol. II, pp. 1-12, Pittman Publ. 1994.
5. M. Ben-Artzi and Y. Dermenjian and J. C. Guillot, Acoustic waves in perturbed stratified fluids: A spectral theory, Comm. in PDE, (1989), 14, (4), 479–517.