“Influence of phosphorus compounds on the formation of ammonium ions by cells of nitrogen-fixing bacteria Аzotobacter chroococcum VKM V-1272” (2020) The Journal of V.N.Karazin Kharkiv National University. Series «Biology», 34(34), pp. 131–140. doi:10.26565/2075-5457-2020-34-14.