1. Atherton, N.M.: Electron spin resonance, theory and applications. Chichester: Ellis Horwood 1973
2. Atkins, P.W., Symons, M.C.R.: The structure of inorganic radicals. Amsterdam, New York: Elsevier 1967
3. Bacon, G.E.: Neutron diffraction in chemistry. London Butterworths 1977;
4. Bacon, G.E.: Adv. Inorg. Chem. and Radiochem. 8, 225 (1966)
5. Bancroft, G.M.: Mössbauer spectroscopy, an introduction. London, New York: McGraw-Hill 1973