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4. I. G. Asylba I. K. Khabirov, and Yu. S. Shakirov, “Assessment of soils of the western part of the Republic of Bashkortostan with respect to element concentrations,” Vestn. Bashkir. Gos. Agrar. Univ., No. 4, 9–14 (2011).
5. Y. N. Vodyanitskii, A. T. Savichev, A. Vasil’ev, E. S. Lobanova, A. N. Chashchin, and E. V. Prokopovich, “Contents of heavy alkaline-earth (Sr, Ba) and rare-earth (Y, La, Ce) metals in technogenically contaminated soils,” Eurasian Soil Sci. 43 (7), 822–832 (2010).