Yang, Benhong, Meng Li, Yun Wu, Chonghai Deng, Jinmei Cao, and Hui Zhang. 2012. “Synthesis and Antimicrobial Activities of a Quaternary Ammonium Salt of Chitosan”. Asian Journal of Chemistry 24 (9):4022-24. https://asianpubs.org/index.php/ajchem/article/view/9532.