1. V. M. Polosin, A. A. Astakhov, V. A. Tafeenko, and A. V. Ivashchenko, Zh. Obshch. Khim.,760, 1580 (1990).
2. R. Tacke and U. Wannagat, Topics in Current Chemistry,84, 1 (1979).
3. V. I. Porotikov, T. I. Bukei, A. V. Varlamov, L. N. Sernov, Yu. V. Natochin, V. T. Bakhteeva, N. S. Prostakov, A. M. Bespalov, A. K. Filippov, T. V. Shal'neva, N. N. Dorofeeva, and G. A. Snegireva, USSR Inventor's Certificate 1729106A1; B. I., No. 4, 34 (1992).
4. V. I. Porotikov, T. I. Polyashova, A. K. Filippov, and A. V. Varlamov, in: Abstracts, All-Union Conference on Neuroscience [in Russian], Kiev (1990), p. 120.
5. W. Brugel, Handbook of NMR Spectral Parameters, London (1979), Vol. 3, p. 657.