Barleany, D. R., Jayanudin, Nasihin, M. Widiawati, M. Yulvianti, D. K. Sari, and A. Gunawan. “Hydrogel Preparation from Shrimp Shell-Based Chitosan: The Degree of Crosslinking and Swelling Study”. ASEAN Journal of Chemical Engineering, Vol. 23, no. 1, June 2023, pp. 28-39, https://journal.ugm.ac.id/v3/AJChE/article/view/9269.