1. R. DÄNDLIKER, in ‘Progress in Optics’, Vol. XVII, edited by E. Wolf (North-Holland, Amsterdam, 1980) p. 1.
2. M. TAKEDA, H. INA and S. KOBAYASHI,J. Opt. Soc. Am. 72 (1982) 156.
3. TH. KREIS,J. Opt. Soc. Am. A3 (1986) 847.
4. J. H. BRUNNING, in ‘Optical Shop Testing’, edited by D. Malacara (Wiley, New York, 1978) 409.
5. B. DÖRBAND,Optik 60 (1982) 161.