BROVARETS, A.A., Y.V. CHOVNYUK, V.T. KRAVCHYUK, і E.A. IVANOV. 2021. «THE QUALITATIVE FRACTAL ANALYSIS OF LONG TERM TIME SERIES FOR AGRICULTURAL SOILS’ ELECTRICAL CONDUCTIVITY PARAMETERS: METHODS OF NONLINEAR DYNAMICS, THEORY OF CHAOS, PHASE TRAJECTORIES». APPLIED QUESTIONS OF MATHEMATICAL MODELLING 4 (2.2):45-54. https://doi.org/10.32782/KNTU2618-0340/2021.4.2.2.4.