“Effect of Different Operational Parameters on Bio-degradation of Chicken Feathers by Aspergillus niger: Investigation Under Submerged Fermentation Process: Parameters on Bio-degradation of Chicken Feathers”, Pakistan Journal of Scientific & Industrial Research, vol. 63, no. 2, pp. 71–76, Jul. 2020, doi: 10.52763/PJSIR.BIOL.SCI.63.2.2020.71.76.