1. J.W. Bruce, P.J. Giblin and C.G. Gibson: On caustics of plane curves. To appear in American Math. Monthly.
2. Source genericity for caustics by reflexion in the plane;Bruce,1980
3. Source genericity of caustics by reflexion in R3;Bruce,1981
4. The duals of generic hypersurfaces;Bruce,1980
5. A memoir on caustics;Cayley;Phil. Trans. R. Soc. London,1857