Aini Sulaiman, N. et al. 2018. Optimization of Alkaline Protease Production by Alkaliphilic Bacillus lehensis G1 using Statistical Design. International Journal of Engineering & Technology. 7, 4.38 (Dec. 2018), 1651–1654. DOI:https://doi.org/10.14419/ijet.v7i4.38.29225.