1. K. Venkataraman (editor), Chemistry of synthetic dyes [in Russian], Vol. 5, Khimiya, Leningrad (1977), p. 35.
2. S.-T. Zhuo, C.-Y. Li, M.-H. Hu, S.-B. Chen, P.-F. Yao, S.-L. Huang, T.-M. Ou, J.-H. Tan, L.-K. An, D. Li, L.-Q. Gu, and Z.-S. Huang, Org. Biomol. Chem., 11, 3989 (2013).
3. A. C. Komor, C. J. Schneider, A. G. Weidmann, and J. K. Barton, J. Am. Chem. Soc., 134, 19223 (2012).
4. A. V. Yeltsov (editor), Laboratory synthesis of intermediates and dyes [in Russian], Khimiya, Leningrad (1985), p. 159.
5. V. G. Koshechko, A. N. Inozemtsev, and V. D. Pokhodenko, Zh. Org. Khim., 12, 2608 (1981).