Md Zain, Masniroszaime, N. T. Kofli, and and S. R. S. Yahya. 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.