1. N. S. Garif'yanov, Dokl. Akad. Nauk SSSR,155 385 (1964).
2. N. S. Garif'yanov, V. N. Fedotov, and N. S. Kucheryavenko, Izv. Akad. Nauk SSSR, Ser. Khim.,4, 743 (1964).
3. R. S. Abdrakhmanov, Theses of the Jubilee Scientific Conference in Honor of the Twentieth Anniversary of the Kazan' Physicotechnical Institute of the Academy of Sciences of the USSR [in Russian], Sektsiya Fiz. N., Kazan' (1966), p. 32.
4. R. S. Abdrakhmanov, Material of the 3rd Conference of Young Scientific Workers of Kazan' [in Russian], Sektsiya Mekhan. Matem. i Fiz-Tekh., Kazan' (1967), p. 32.
5. I. L. Verbeek and P. F. Cornaz, Rec. Trav. Chim.,86, 209 (1967).