Onibokun, A.E. et al. 2021. Purification and Characterization of Phytase Produced by Aspergillus niger Isolated from Poultry Farm Soil Using Submerged Fermentation: doi.org/10.26538/tjnpr/v5i6.17. Tropical Journal of Natural Product Research (TJNPR). 5, 6 (Jun. 2021), 1083–1087.