1. Flegontov, S.A., Titova, Z.S., Stolyarov, A.P., Buzykin, B.I., and Kitaev, Yu.P., Izv. Akad. Nauk SSSR, Ser. Khim., 1979, no. 5, p. 1014.
2. Dolgarev, A.V., Lukachina, V.V., and Karpova, O.I., Zh. Anal. Khim., 1974, vol. 29, p. 721.
3. Pihlaja, K., Simeonov, M.F., and Fulop, F., J. Org. Chem., 1997, vol. 62, p. 5080.
4. Katz, L., Karger, L.S., Schroeder, W., and Cohen, M.S., J. Org. Chem., 1953, vol. 18, p. 1380.