Jian, Liu, et al. “Enhancing Lignin Degradation by Mn2+ Ion Supplementation to Assist Enzymatic Hydrolysis of Cellulose in a Two-Stage Pretreatment of Bamboo”. International Journal of Agricultural and Biological Engineering, vol. 10, no. 3, May 2017, pp. 175-84, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2991.