1. Rachkova, N.G., Shuktomova, I.I., and Karmanov, A.P., Butlerovsk. Soobshch., 2016, vol. 45, no. 3, pp. 60–67.
2. Klemt, E., Spasova, Y., and Zibold, G., in Environmental Radioactivity in the Arctic and Antarctic: Proc. 15th Conf., St. Petersburg, 2002, pp. 67–70.
3. Shuktomova, I.I., Taskaev, A.I., and Titaeva, N.A., Radiokhimiya, 1983, vol. 25, no. 4, pp. 547–550.
4. Arinushkina, E.V., Rukovodstvo po khimicheskomu analizu pochv (Manual on Chemical Analysis of Soils), Moscow: Mosk. Gos. Univ., 1962.
5. Syromyatnikov, N.G., Ivanova, E.I., and Trofimova, L.A., Radioaktivnye elementy kak geokhimicheskie indikatory porodo-i rudoobrazovaniya (Radioactive Elements as Geochemical Indicators of Rock and Ore Formation), Moscow: Atomizdat, 1976.