1. H. Batiz-Hernandez and R. A. Bernheim, Progress in NMR Spectroscopy, Vol. 3, Pergamon Press, Oxford (1967), pp. 63?86.
2. P. M. Borodin, V. A. Shcherbakov, E. K. Legin, et al., Zh. Strukt. Khim.,4, 266 (1963).
3. C. Deverell, K. Schaumburg, and H. J. Bernstein, J. Chem. Phys.,49, 1276 (1968).
4. H. G. Hertz, J. Sol. Chem.,2, 239 (1973).
5. V. A. Shcherbakov, B. N. Chernyshov, and R. L. Davidovich, Zh. Strukt. Khim.,14, 1109 (1973).