1. Abel, I. R., “Mirror Systems: Engineering Features, Benefits, Limitations and Applications,” Proc. SPIE 531, p. 121 (1985).
2. “Some Ideas about Representations of Aspheric Optical Surfaces,”;Su;Appl. Opt.,1985
3. “Closed-Form Solutions for Imaging Systems, Corrected for Third-Order Aberrations,”;Korsch;J.O.S.A.,1973
4. “Two Well-Corrected Four-Mirror Telescopes,”;Korsch;Appl. Opt.,1974
5. McCarthy, E. L., “Anastigmatic Catoptric Systems.” U.S. Patent No. 3,062,101 (Nov. 6, 1962).