Nitisinprasert, S., Pornwirun, W., & Keawsompong, S. (1999). Characterizations of Two Bacterial Strains Showing High Keratinase Activities and Their Synergism in Feather Degradation. Agriculture and Natural Resources, 33(2), 191–199. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/240479