1. Sobotovich, E.V., Bondarenko, G.N., and Ol’khovik, Yu.A., Radiokhimiya v zone vliyaniya ChAES (Radiochemistry in the Impact Zone of the Chernobyl Nuclear Power Plant), Kyiv: Naukova Dumka, 1992.
2. Plyushchev, V.E. and Stepin, B.D., Analiticheskaya khimiya rubidiya i tseziya (Analytical Chemistry of Rubidium and Cesium), Moscow: Nauka, 1975.
3. Ivanov, V.M., Semenenko, K.A., Prokhorova, G.V., and Simonov, E.F., Natrii (Sodium), Moscow: Nauka, 1986.
4. Andersson, K.G., Roed, J., and Fogh, C.L., J. Environ. Radioact., 2002, vol. 62, pp. 49–60.
5. Bazhenov, V.A., Buldakov, L.A., Vasilenko, I.Ya., et al., Vrednye khimicheskie veshchestva. Radioaktivnye veshchestva: Spravochnoe izdanie (Harmful Chemical Substances. Radioactive Substances: Handbook), Il’- in, L.A., Filov, V.A., et al., Eds., Leningrad: Khimiya, 1990.