Pouryafar, Fatemeh, et al. “COMPARATIVE STUDIES OF ALKALINE PROTEASE PRODUCTION IN SOLID STATE FERMENTATION: TRAY BIOREACTOR AND FLASK”. Pakistan Journal of Biotechnology, vol. 12, no. 1, Mar. 2015, pp. 7-13, https://pjbt.org/index.php/pjbt/article/view/124.