1. Buchachenko A.L., Vasserman A.M.: Stable Radicals (in Russian). Moscow: Khimija 1973
2. Berliner L. (ed.): Spin Labeling. Theory and Application, vols. 1, 2. New York: Academic Press 1976, 1979.
3. Likhtenstein G.I.: Spin-Labeling Methods in Molecular Biology. New York: Wiley Interscience 1989.
4. Vasserman A.M., Kovarski A.L.: Spin Labels and Probes in Physics and Chemistry of Polymers (in Russian). Moscow: Nauka 1986.
5. Bartenev G.M., Sanditov D.S.: Relaxation Processes in Glass-State Systems (in Russian) Novosibirsk: Nauka 1986.