1. Born, M., & Wolf, E. (1970). Principles of optics. Pergamon Press.
2. Chapman, J. N., et al. (1978). Ultramicroscopy, 3, 203.
3. Cockayne, D. J. H., et al. (1969). Philosophical Magazine, 20, 1265.
4. Cowley, J.M. (1969). Applied Physics Letters, 15, 58.
5. Dekker, N. H., & De Lang, H. (1974a). Optik, 44, 452.