1. N. A. Agadzhanyan and A. V. Skalny, Chemical Elements in the Environment and the Human Ecological Portrait [in Russian], Izd. KMK, Moscow (2001), pp. 9–11.
2. N. A. Agadzhanyan, A. V. Skalny, and V. Yu. Detkov, Ekol. Chel., No. 11, 3–12 (2013).
3. A. P. Avtsyn, A. A. Zhavoronkov, M. A. Rish, and L. S. Strochkova, Human Microelementoses: Etiology, Classification, Organ Pathology [in Russian], Meditsina, Moscow (1991), pp. 40–41.
4. T. Ya. Korchina, Ekol. Chel., No. 3, 32–36 (2007).
5. D. L. Tsalev, J. Anal. At. Spectrom., 9, No. 3, 405–414 (1994).