R. A. Mindibayev, M. G. Ishbulatov, K. M. Safin, A. G. Baikov, and F. M. Davletshin, “Current State of Soil Fertility Level of the Northern Forest Steppe of the Republic of Bashkortostan”, JEAM, vol. 9, no. 1, pp. 9–17, Aug. 2026, doi: 10.5890/JEAM.2021.03.002.