Mongkolkajit, J., J. Pullsirisombat, S. Prichanont, V. Tantayakom, P. Prasitchoke, and M. Phisalaphong. “γ-Alumina Doped Alginate Gel for Cell Immobilization in Fermentation Processes”. ASEAN Journal of Chemical Engineering, Vol. 10, no. 1, Dec. 2010, pp. 1-7, https://journal.ugm.ac.id/v3/AJChE/article/view/8060.