References
- HERZBERGER , M. 1958 . Modern Geometrical Optics , New York : Interscience Publishers, Inc. .
- LUNEBERG , R. K. 1944 . Mathematical Theory of Optics , Providence , R.I. : Brown University Press .
- STEPHENS , R. E. 1959 . J. opt. Soc. Amer. , 49 : 398