“Influence of Phosphorus Compounds on the Formation of Ammonium Ions by Cells of Nitrogen-Fixing Bacteria Аzotobacter Chroococcum VKM V-1272”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», vol. 34, no. 34, July 2020, pp. 131-40, https://doi.org/10.26565/2075-5457-2020-34-14.