Rattananuch Chunpen, Duangrat Inthon, and Patana Thavipoke. “Development of a New Microbial Toxicity Test Based on Inhibition of Alpha-Amylase Production and Its Sensitivity Against Metal Contaminants”. Agriculture and Natural Resources, vol. 55, no. 1, Jan. 2021, pp. 113-8, https://li01.tci-thaijo.org/index.php/anres/article/view/249297.