Popirny, M. A., Nikolov, O. T., & Skrylnik, E. V. (2016). Effect of soil tillage intensity on the composition, physical and chemical properties of the second fraction of humic acids extracted from the typical black soil. Biophysical Bulletin, 1(35), 34-45. https://doi.org/10.26565/2075-3810-2016-35-05