Born, Max and Wolf, Emil , 1999,
Principles of Optics, London, U.K.: Cambridge
University Press, ISBN 0 521 63921 2
Stavroudis, O.N. and Hurtado, 2000 The k-function
and the Maxwell equations, J.Opt. Society. Am. A17.
Stavroudis, O.N. 1996 The Caustic as an expression
of the Image errors of a lens, Vol 22, OSA Proceedings
of the International Optical Design Conference, pp 87-91
Stavroudis, O.N. 1995 Refraction of the k-function
at spherical surfaces, J.Opt. Society. Am. A12 1805-1811
Stavroudis, O.N. 1995 The k-function in geometrical
optics and its relationship to the archetypal wavefront and
the caustic, J.Opt. Society. Am. A12 1010-1016
Stavroudis, O.N. 1987, Tracing Wavefronts: Can it be
done? SPIE Vol.766 'Recent trends in optical design' pp
18-26
