Barleany, Dhena Ria, et al. “Acrylic Acid Neutralization for Enhancing the Production of Grafted Chitosan Superabsorbent Hydrogel”. International Journal on Advanced Science, Engineering and Information Technology, vol. 7, no. 2, Apr. 2017, pp. 702-8, doi:10.18517/ijaseit.7.2.2340.