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2. K. M. Salikhov, A. G. Semenov, and Yu. D. Tsvetkov, Electron Spin Echo and Its Applications [in Russian], Nauka, Novosibirsk (1976).
3. S. A. Dikanov, V. F. Yudanov, and Yu. D. Tsvetkov, Zh. Strukt. Khim.,18, 460 (1977).
4. L. Kevan, in: Time Domain Electron Spin Resonance, L. Kevan and R. Schwartz eds., Wiley-Interscience, New York (1979), Chapter 8.
5. W. B. Mims and J. Peisach, in: Biological Application of Magnetic Resonance, R. G. Shulman, ed., Academic Press, New York (1979).