1. A. Abragam,Principles of Nuclear Magnetism (Oxford Univ. Press, London, 1961).
2. C. D. Jeffries,Dynamic Nuclear Orientation (Interscience Publishers, New York, 1963).
3. M. Goldman,Spin Temperature and Magnetic Resonance in Solids (Oxford Univ. Press, London, 1970).
4. M. Borghini, G. Shapiro, ed., inProc. 2nd Internat. Conf. on Polarized Targets, Berkeley, 1971 (LBL 500, UC-34 Physics, National Technical Information Service, Springfield, Virginia, 1972), p. 1, and references quoted therein.
5. L. L. Buishvili,Zh. Eksp. Teor. Fiz. 49, 1968 (1965) [English transl.,Soviet Phys.?JETP 22, 1277 (1966)]; L. L. Buishvili, M. D. Zviadadze, and G. R. Khutsishvili,Zh. Eksp. Teor. Fiz. 54, 876 (1968) [English transl.,Soviet Phys.?JETP 27, 469 (1968)].