Md Zain, M., Kofli, N. T., & Yahya, and S. R. S. (2011). Bioethanol Production by Calcium Alginate-Immobilised St1 Yeast System: Effects of Size of Beads, Ratio and Concentration. IIUM Engineering Journal, 12(4). https://doi.org/10.31436/iiumej.v12i4.159