1. Ingram J.E.: Free Radicals as Studied by Electron Spin Resonance. London: Butterworths 1958.
2. Lindblom R. in: Free Radicals in Biological Systems (Blois M.S. Jr., Brown H.M., Lemmon R.L., Lindblom R.O., Weissbluth M., eds.). New York: Academic Press 1961.
3. Poole C.P. Jr.: Electron Spin Resonance. A Comprehensive Treatise on Experimental Techniques. New York: Wiley-Interscience 1967.
4. Alger R.S.: Electron Paramagnetic Resonance. Techniques and Applications. New York: Wiley-Interscience 1968.
5. Wertz J.E., Bolton J.R.: Electron Spin, Resonance. Elementary Theory and Practical Applications. New York: McGraw-Hill 1972.