1. E. Kreyszig: A dvanced Engineering Mathematics (Wiley, New York 1972).
2. A. A. Khinchin: A Course of Mathematical Analysis (translated from Russian) (Hindustan Publishing, Delhi 1960).
3. M. Kline, I. W. Kay: Electromagnetic Theory and Geometrical Optics (Interscience, New York 1965).
4. R. K. Luneburg: Mathematical Theory of Optics (University of California Press, Berkeley 1964).
5. K. Maeda, I. Kimura: Electromagnetic Theory (Ohm-Sha, Tokyo 1970).