1. A. Abragam, The Principles of Nuclear Magnetism (Clarendon Press, Oxford, 1994), 614 pp. Reprint edition
2. J.S. Waugh, New NMR Methods in Solid State Physics (Mir, Moscow, 1978), 179 pp. [Russian translation]
3. U. Heberlen, M. Mehring, High Resolution NMR in Solids (Mir, Moscow, 1980), 504 pp. [Russian translation]
4. R.S. Knox, Theory of Excitons (Mir, Moscow, 1966), 219 pp. [Russian translation]
5. L.V. Keldysh, Collective properties of excitons in semiconductors, in Excitons in Semiconductors, adv. ed. B.M. Vul (Nauka, Moscow, 1971), pp. 5–18