1. Litvinov, V.P., Usp. Khim., 2003, vol. 72, p. 75.
2. Litvinov, V.P., Dotsenko, V.V., and Krivokolysko, S.G., Khimiya tienopiridinov i rodstvennykh sistem (Chemistry of Thienopyridines and Related Systems), Moscow: Nauka, 2006, p. 405.
3. Wohl, A., Ber. Deutsch. Chem. Ges., 1886, vol. 19, p. 2344.
4. Angiolini, L., Duke, R.P., Jones, A.Y., and Katritzky, A.R., J. Chem. Soc., Perkin Trans. 2, 1972, p. 674.
5. Allev, R.S., Dal’nova, Yu.S., Popov, Yu.N., Masagutov, R.M., and Rafikov, S.R., Dokl. Akad. Nauk SSSR, 1988, p. 873.