1. R. Livingston, J. Chem. Phys., 57, 396, 1953.
2. G. K. Semin and A. I. Kitaigorodskii, Summarries of Papers at the First All-Union Conference on Physical Methods in Research on Structure and Reactivity [in Russian], Frunze, 1962.
3. G. K. Semin, DAN SSSR, 158, 1169, 1964.
4. G. K. Semin and A. A. Fainzil'berg, ZhSKh, 6, 213, 1965.
5. G. K. Semin, Transactions of the All-Union Conference on Magnetic-Resonance Studies of the Properties of Solids, Krasnoyarsk, 1964 [in Russian], Atomizdat, 1967.