Fithriani, D., and .-. Nurhayati. “Optimization of the Condition of Phytosterol Extraction Conditions from Microalgae Nannochloropsis Using Ethanol of Different Purity Levels”. Journal of Bio-Science, vol. 27, Dec. 2019, pp. 143-8, doi:10.3329/jbs.v27i0.44679.