1. Goldberg I.B.: J. Magn. Reson.32, 233 (1978)
2. Abe K., Watanabe T., Fujiwara S.: Bunseki Kagaku27, T9 (1978)
3. Levinson Y.B.: private communication.
4. Eaton S.S., Eaton G.R.: Bull. Magn. Reson.1, 130 (1980)
5. Kasimov R.M., Shakhparonov M.I., Akhadov Ya. Yu.: Zh. Strukt. Khim.2, 13 (1961)