1. MENDELEEV, D. I. The Fundamentals of Chemistry. 13th edn. 1947, page 569 (In Russian).
2. The Chemistry of the Actinide Elements;SEABORG,1957
3. SMITH, G. P. Atomic Energy for Peaceful Purposes.
4. Nuclear Reactor Materials. Russian translation of original English text. Edited by U. N. SOKURSKOV. Atomizdat, 1963.
5. CROXTON, F. E. Uranium and Its Compounds. A Bibliography of Unclassified Literature. K - 295, Part 2, USA AEC, Oak Ridge, Tennessee, 1955, pp. 1–708.