M. F. . Zukhri, A. . Hamzah, and M. K. . Anam, “Optimization of Bioethanol Production From Chlorella Vulgaris With Ca2+,Mg2+, and Zn2+ Ion Suplements Through Separated Hydrolysis and Fermentation Using Respon Surface Methodology”, joe, vol. 11, no. 1, pp. 70–80, Sep. 2025.