Nwokeh, Uchenna Jonathan, et al. “Protease and Phytohormone Production by Potassium Solubilizers Isolated from Maize Rhizosphere”. Direct Research Journal of Agriculture and Food Science, vol. 12, no. 3, Dec. 2024, pp. 123-30, https://journals.directresearchpublisher.org/index.php/drjafs/article/view/71.