1. I. N. Beckman, Radii: Uchebnoe posobie (Radium: A Tutorial) (2010), p. 14;
2. L. D. Riabev, ed. Atomnyi proekt SSSR: Dokumenty i materialy (The Atomic Project of the USSR: Documents and Materials), vol. 1, part 2, Nauka (2002), p. 450.
3. Ref. 1, L. D. Riabev, p. 450;
4. L. L. Zaitseva, “Nachalo sistematicheskogo izucheniia mestorozhdenii radioaktivnykh mineralov na territorii dorevoliutsionnoi Rossii (raboty V. I. Vernadskogo)” (“The beginning of the systematic study of radioactive minerals mines in the territory of prerevolutionary Russia [the work of V. I. Vernadsky]”) (undated), fond 1766, opis’ 1, delo 11, Archive of the Russian Academy of Sciences, Moscow.