1. For example, M. Born and E. Wolf, Principles of Optics, 2nd edit. London and New York 1964
2. A. Sommerfeld, Optics (Vol. IV of Lectures on Theoretical Physics, translated by O. Laporte and P. A. Moldauer)
. New York: Academic Press 1954.
3. R. K. Luneburg: Mathematical theory of optics. Berkeley, U.S.A.: University of California Press 1965.
4. M.Kline and W. Kay: Electromagnetic theory and geometrical optics. London: John Wiley & Sons 1965.
5. See e.g. L. C. Martin and W. T. Welford, Technical Optics, Vol. I, second ed. London: Pitman 1966