1. R. B. Comizzoli, G. S. Lozier and D. A. Ross, Proc. IEEE 60 (1972) 338.
2. C. J. Claus, Image Technol. Part II (4/5) (1969).
3. L. J. Schwartz, Photo. Sci. Eng. 18 (1974) 159.
4. Y. HayashI, M. Hasegawa and E. Ano, Preprints of Paper Summaries, 25 th Annual Conference of the Society of Photographic Scientists and Engineers, 1972, p. 116.
5. J. H. Neyhart, Photo. Sci. Eng. 10 (1966) 126.