DURAIRAJ, K., A. SOMAPRABHA, and V. R. ALAGAMMAI. “BIODEGRADATION OF FEATHER WASTE BY EXTRACELLULAR KERATINASE FROM SPORULATING MICROORGANISMS”. UTTAR PRADESH JOURNAL OF ZOOLOGY, Vol. 42, no. 7, Apr. 2021, pp. 83-00, http://mbimph.com/index.php/UPJOZ/article/view/2061.