Tian, Yanjun, Yixiao Fan, Jianjun Liu, Xiangying Zhao, and Wei Chen. 2016. “Effect of Nitrogen, Carbon Sources and Agitation Speed on Acetoin Production of Bacillus Subtilis SF4-3”. Electronic Journal of Biotechnology 19 (1). Valparaíso, Chile. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/2015.11.005.