Narayanan, N., P. K. Roychoudhury, and A. Srivastava. “L (+) Lactic Acid Fermentation and Its Product Polymerization”. Electronic Journal of Biotechnology, vol. 7, no. 2, Aug. 2004, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v7n2-7.