1. Becker, W., and Mitter, H., ‘Motion of relativistic particles in standing wave fields II: Particles with spin’ (in preparation).
2. Coddington, E.A., and Levinson, N.,Theory of Ordinary Differential Equations, McGraw-Hill, 1995.
3. Eastham, M.S.P.,The Spectral Theory of Periodic Differential Equations, Scottish Academic Press, 1973.
4. Becker, W., Meckbach, R., and Mitter, H., ‘Motion of relativistic particles in standing wave fields’, Univ. Tübingen, preprint 1978.