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2. V. V. Karpov, G. N. Rodionova, J. V. Krutovskaya, L. Z. Gandel’sman, L. A. Khomenko, and L. M. Yagupol’skii, Dyes and Pigments 5, 285 (1984).
3. D. R. Waring and R. M. Bellas, British Patent 1503907 (to Kodak).
4. R. I. Steiner, U.S. Patent 4234481 (to Crompton and Knowles) [CA 94, 104890 (1981)].
5. J. Gray and D. R. Waring, British Patent 1558403 (to Kodak) [CA 92, 165209 (1980)].