1. G. Seaborg and J. Katz, The Actinides (Foreign Lit. Press, 1955).
2. W. H. Reas, The Transuranium Elements (McGraw-Hill, 1949), 4, 14B, I, 423.
3. Beilsteins, Handbuch det Organischen Chemie 2, 477 (1942).
4. I. M. Kolthoff and D. D. Lingane, Polarography, (Foreign Lit, Press, 1945).
5. J. Heyrovsky and D. Ilkovic, Coll. Czech. Chem. Commun. 7, 198 (1935).