Zhou, Y., S. Pan, T. Wu, X. Tang, and L. Wang. “Optimal Immobilization of β-Glucosidase into Chitosan Beads Using Response Surface Methodology”. Electronic Journal of Biotechnology, vol. 16, no. 6, Nov. 2013, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v16n6-5.