1. E.G. Rozantsev, Free Nitroxyl Radicals (Plenum Press, New York, 1970)
2. V.N. Parmon, A.I. Kokorin, G.M. Zhidomirov, Stable Biradicals (Nauka, Moscow, 1980)
3. E.G. Rozantsev, R.I. Zhdanov (eds.), Nitroxide Radicals. Synthesis, Chemistry, Applications (Nauka, Nauka, 1987)
4. L.B. Volodarsky (ed.), Nitroxide. Synthesis, Properties, Applications, vol. 1, 2 (CRC Press, Boca Raton, 1988)
5. A. Rassat, Pure Appl. Chern. 62, 223 (1990)