1. E. Kreyszig: Advanced 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 ) 5.6 A. Sommerfeld: Optics ( Academic, New York 1954 )