Unrean, Pornkamol, Nhung H.A. Nguyen, Wonnop Visessanguan, and Panit Kitsubun. “Improvement of nattokinase production by Bacillus subtilis using an optimal feed strategy in fed-batch fermentation”. Asia-Pacific Journal of Science and Technology 17, no. 5 (April 14, 2017): 769–777. accessed April 8, 2025. https://so01.tci-thaijo.org/index.php/APST/article/view/83287.