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2. A. Abragam, The Principles of Nuclear Magnetism, (Clarendon Press, Oxford, 1961).
3. B. Cowan, Nuclear Magnetic Resonance and Relaxation, (Cambridge University Press, Cambridge, 1997)
4. R.S. Alger, Electron Paramagnetic resonance: Techniques and Applications, 2nd edn. (Wiley, New Jersey, 1968)
5. C.P. Poole Jr, Electron spin resonance, 2nd edn. (Dover Publications Inc., New York, 1983)