1. J. F. Hamilton, in: The Theory of the Photographie Process, 4th ed. (T. H. James, ed.), Chapter 5, Macmillan, New York (1977).
2. W. West and P. B. Gilman, Jr., in: The Theory of the Photographic Process, 4th ed. (T. H. James, ed.), Chapter 10, Macmillan, New York (1977).
3. H. W. Vogel, Ber. 6, 1302 (1873).
4. B. Homolka, U.S. Patent 844,804.
5. E. Q. Adams and H. L. Haller, J. Am. Chem. Soc. 42, 2661 (1920).