Wu, H., Yuan, R., Wan, Y., Yin, W., & Pang, L.-L. (2010). Synthesis of N-Substituted 1,3,5-Triazacyclohexanes Catalyzed by Starch Sulfuric Acid. Asian Journal of Chemistry, 22(2), 1097–1102. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/11233