1. V. A. Reznikov and L. B. Volodarskii, Izv. Akad. Nauk SSSR, Ser. Khim., No. 2, 390 (1990).
2. V. V. Martin and L. B. Volodarskii, Izv. Akad. Nauk SSSR, Ser. Khim., NO. 6, 1336 (1980).
3. D. St. C. Black, V. M. Clark, R. S. Thakur, and A. Todd, J. Chem. Soc., Perkin 1, No. 18, 1951 (1976).
4. I. A. Grigor'ev and S. A. Dicanov, Imidazoline Nitroxides [in Russian], Vol. 1, edited by L. B. Volodarskii (Volodarsky), CRC Press, Inc., Boca Raton, Florida (1988), p. 101.
5. V. A. Reznikov and L. B. Volodarskii, Khim. Getewtsikl. Soedin., No. 7, 921 (1990).