Yandris, et al. “Effect of Immobilization Towards Thermal Stability of a-Amylase Isolated from Locale Bacteria Isolate Bacillus Subtilis ITBCCB148 With Calcium Alginate”. Asian Journal of Chemistry, vol. 25, no. 12, June 2013, pp. 6897-9, doi:10.14233/ajchem.2013.15111.