1. Aivazyan, A.D., Geochemical specialization of Altay flora, Extended Abstract of Cand. Sci. (Geogr.) Dissertation, Moscow, 1974.
2. Alexeeva-Popova, N.V., Drozdova, I.V., and Kalimova, I.B., Accumulation and hyperaccumulation of heavy metals by cruciferous of North Caucasus flora in connection with phytoremediation problems, Geokhimiya, 2015, no. 3, pp. 1–9.
3. Bargagli, R., Trace Elements in Terrestrial Plants: an Ecophysiological Approach to Biomonitoring and Biorecovery, Berlin: Springer-Verlag, 1998.
4. Beznosikov, V.A., Lodygin, E.D., and Kondratenok, B.M., Assessment of background concentrations of heavy metals in soils of the northeastern part of European Russia, Eurasian Soil Sci., 2007, vol. 40, no. 9, pp. 949–955.
5. Cary, E.E., Allway, W.H., and Olson, O.E., Control of chromium concentrations in food plants. I. Absorption and translocation of chromium in plants. II. Chemistry of chromium in soils and its availability to plants, J. Agric. Food Chem., 1977, vol. 25, no. 2, pp. 300–305.