1. T. N. Gerasimova and V. V. Shelkovnikov,Usp. Khim., 1992,61, 102 [Russ. Chem. Rev., 1992,61 (Engl. Transl.)].
2. G. Green-Buckley and J. Griffits,J. Chem. Soc., Perkin Trans, 1, 1979, 702.
3. B. A. Tilak, inKhimiya sinteticheskikh krasitelei [Chemistry of Synthetic Dyes], Ed. K. Venkataraman, Khimiya, Leningrad, 1974,3, 2097 (in Russian).
4. L. S. Efros, G. N. Kul'bitskii, and M. G. Romanova,Khim. Geterotsikl. Soedin., 1970, 219 [Chem. Heterocycl. Compd., 1970 (Engl. Transl.)].
5. A. P. Krapcho, M. E. Petry, and M. P. Macker,J. Med. Chem., 1990,33, 2661.