1. and DBP application P 2 653 667.4 (1976).
2. and DOS 2 553 568 (1977).
3. and to be published.
4. Metal Alkoxides and Dialkylamides
5. and in ?MTP International Reviews of Science, General Chemistry of the Transition Metals?, Vol. 5, Part 1, p. 65, Butterworths, London 1972.