I. S. Pajčin, V. Vlajkov, J. Dodić, A. Jokić, and J. Grahovac, “BIOTECHNOLOGICAL PRODUCTION OF PLANT INOCULANTS BASED ON NITROGEN-FIXING BACTERIA”, J.Proc.En.Agr., vol. 25, no. 2, pp. 56–63, May 2021, doi: 10.5937/jpea25-31071.