1. W. J. Smith: Modern Optical Engineering (McGraw-Hill, New York, 2008) 4th ed., p. 754.
2. R. Fisher and B. Tadic-Galep: Optical System Design (McGraw-Hill, New York, 2008) 2nd ed., p. 809.
3. R. R. Shannon: The Art and Science of Optical Design (Cambridge University Press, Cambridge, U.K., 1997) p. 602.
4. M. J. Kidger: Fundamental Optical Design (SPIE, Bellingham, WA, 2002) p. 290.
5. M. J. Kidger: Intermediate Optical Design (SPIE, Bellingham, WA, 2004) p. 222.