Konglom, N. ., C. . Chuensangjun, C. . Pechyen, and S. Sirisansaneeyakul. “Production of Poly-?-Glutamic Acid by <i>Bacillus licheniformis</I>: Synthesis and Characterization”. Journal of Metals, Materials and Minerals, vol. 22, no. 2, Dec. 2012, https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/44.