TAMURA, H., K. WADA, R. VANIT, and S. TOKURA. “Preservation of Chitosan Aqueous Gel under Neutral Conditions”. Journal of Metals, Materials and Minerals, vol. 15, no. 1, Aug. 2022, pp. 19-21, https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/1473.