1. R. F. Weinland and O. Köppen, Z. Anorg. Allg. Chem., 22, No. 1, 266–276 (1899).
2. K. J. Gallagher and M. R. Ottaway, J. Chem. Soc. Dalton., 2212–2219 (1977).
3. R. L. Davidovich, Atlas of Derivatograms of Complex Fluorides of Metals of III–V Groups [in Russian], Nauka, Moscow (1976).
4. Yu. Ya. Kharitonov, R. L. Davidovich, and V. I. Kostin, Atlas of Long-wave Infrared Absorption Spectra of Complex Fluorides of Metals of III–V Groups and Uranyl [in Russian], Nauka, Moscow (1977).
5. J. E. Roberts and A. W. Laubengayer, J. Am. Chem. Soc., 79, No. 22, 5895–5897 (1957).