1. S.A. Benton: J. Opt. Soc. Am. 59 (1969) 1545A.
2. D. Leseberg and O. Bryngdahl: Appl. Opt. 23 (1984) 2441.
3. D. Leseberg: J. Opt. Soc. Am. A 3 (1986) 1846.
4. H. Yoshikawa and H. Taniguchi: Proc. Soc. Photo-Opt. In-strum. Eng. 2885 (1996) 26.
5. P. St.-Hilaire, S.A. Benton, M. Lucente, M.L. Jepsen, J. Kollin, H. Yoshikawa and J. Underkoffler: Proc. Soc. Photo-Opt. In-strum. Eng. 1212 (1990) 174.