1. Haeberlen U., High Resolution NMR Spectroscopy in Solids: Selective Averaging, Academic, New York, San Francisco, London, 1976.
2. Mehring M., High Resolution NMR Spectroscopy in Solids, Springer, Berlin Heidelberg New York, 1983.
3. Ivanov Y. N., Provotorov B. N. and Fel'dman E. B., Pis'ma v Z. Eksp. Teor. Fiz. 27 (1978), 164; (Sov. Phys. JETP 24 (1978), 135).
4. Ainbinder N. E. and Furman G. B., Z. Eksp. Teor. Fiz. 85, (1983), 988; Sov. Phys. JETP 58 (1983), 575.
5. Maricq M. M., Phys. Rev. Lett. 56 (1986), 1433.