1. Applied Optics and Optical Design;Conrady,1929
2. Lens Design Fundamentals;Kingslake,1978
3. Color correction in optical systems and types of glass;Herzberger;J Opt Soc Am,1949
4. Modern Geometrical Optics;Herzberger,1958
5. Selection of glasses for three-color achromats;Stephens;J Opt Soc Am,1949