1. Mittleman, M.H.: Introduction to the theory of laser-atom interactions. New York: Plenum Press 1982
2. Rahman, N.K., Guidotti, C.: Photon-assisted collisions and related topics. Chur: Harwood Academic Publishers 1983
3. Weingartshofer, A., Holmes, J.K., Sabbagh, J., Chin, S.L.: J. Phys. B16, 1805?1817 (1983)
4. Rahman, N.K., Faisal, F.H.M.: J. Phys. B9, L275?277 (1976)
5. Rahman, N.K., Faisal, F.H.M.: J. Phys. B11, 2003?2014 (1978)