Al-Sa’ady, Ali J. R. “Optimize and Purification of Keratinase Produced from Local Aspergillus Terreus A13 Isolate Using A Feather As Substrate”. Iraqi Journal of Science 64, no. 10 (October 30, 2023): 5051–5063. Accessed December 14, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/8425.