1. V. M. Buznik, Nuclear Magnetic Resonance in Ionic Crystals (Nauka, Novosibirsk, 1981).
2. G. E. Peterson, P. M. Bridenbaugh, and P. Green, J. Chem. Phys. 46(10), 4009 (1967).
3. V. A. Golenishchev-Kutuzov, U. Kh. Kovpillem, L. N. Rashkovich, and N. F. Evlanova, Fiz. Tverd. Tela (Leningrad) 10, 759 (1968) [Sov. Phys. Solid State 10, 594 (1968)].
4. V. L. Bogdanov, V. V. Lemanov, V. P. Klyuev, and S. A. Fedulov, Fiz. Tverd. Tela (Leningrad) 10, 1118 (1968) [Sov. Phys. Solid State 10, 886 (1968)].
5. T. K. Halstead, J. Chem. Phys. 53(9), 3427 (1970).