1. N. G. Yunga, G. V. Lagodzinskaya, and G. B. Manelis, Izv. Akad. Nauk SSSR, Ser. Khim., 2443 (1975).
2. N. G. Yunga, G. V. Lagodzinskaya, É. B. Fel'dman, and G. B. Manelis, Izv. Akad. Nauk SSSR, Ser. Khim., 1285 (1977).
3. L. N. Erofeev and A. A. Zhirnov, Inventor's Certificate No. 265545, June 22, 1968; Byull. Izobret., No. 10, 130 (1970).
4. J. A. Pople, W. G. Schneider, and H. J. Bernstein, High Resolution Nuclear Magnetic Resonance, McGraw-Hill (1959).
5. E. Grunwald, A. Loewenstein, and S. Meiboom, J. Chem. Phys.,27, 630 (1957).