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2. V. N. Afanas’ev and A. P. Tsypin, Econometrics in STATISTICA Software: Manual for Laboratory Practicum (Orenburg State Univ., Orenburg, 2008) [in Russian].
3. Yu. N. Blagoveshchenskii, The Secrets of Correlation Relationships in Statistics (Nauchnaya Kniga, Moscow, 2009) [in Russian].
4. G. P. Gamzikov, Nitrogen in Agriculture of Western Siberia (Nauka, Moscow, 1981) [in Russian].
5. A. N. Gennadiev, K. R. Olson, S. S. Chernyanskii, and R. L. Jones, “Quantitative assessment of soil erosion and accumulation processes with the help of a technogenic magnetic tracer,” Eurasian Soil Sci. 35 (1), 17–29 (2002).