1. R. Silva, T. Sikkeland, M. Nurmia, and A. Ghiorso, Inorg. Nucl. Chem. Lett. (in press).
2. L. J. Nugent, R. D. Baybarz and J. L. Burnett, J. Phys. Chem. (in press).
3. The Periodic System and Synthesis of New Elements;Flerov,1969
4. American Chemical Society, Mendeleev Centennial Symposium;Seaborg,1969