1. Davies, E. B.: Parametric interactions and scattering. To appear
2. Goldstein, J. A., Monlezun, C. J.: Temporally inhomogeneous scattering theory. II. Approximation theory and second order equations. To appear
3. Howland, J. S.: Stationary scattering theory for time-dependent Hamiltonians. To appear
4. Kato, T.: Wave operators and similarity for some non-self-adjoint operators. Math. Ann.162, 258?279 (1966)
5. Kato, T.: Perturbation theory for linear operators. Berlin-Heidelberg-New York. Springer 1966