Khamson, A., Sumpavapol, P., Tangwatcharin, P., & Sorapukdee, S. (2019). Optimization of microbial collagenolytic enzyme production by Bacillus subtilis subsp. Subtilis S13 using Plackett-Burman and response surface methodology. International Journal of Agricultural Technology, 15(6), 913–924. retrieved from https://li04.tci-thaijo.org/index.php/IJAT/article/view/8333