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3. http://kfti.knc.ru/eng/zavoisky/awholders.html
4. S. A. Al'tshuler, Proceedings of the XIVth Colloque Ampère, 588 (1966).
5. A. Abragam and B. Bleaney, Electron Paramagnetic Resonance of Transition Ions (Clarendon Press, Oxford, 1970).