1. On tracing rays through an optical system (second paper);Smith;Proc. Phys. Soc. (London),1918
2. Literature survey on ray tracing;Weinstein,1956
3. A classification of photographic lens types;Kingslake;J. Opt. Soc. Am.,1946
4. Lenses for aerial photography;Kingslake;J. Opt. Soc. Am.,1942
5. Optics: The Technique of Definition;Cox,1956