Soleimani, Fatemeh, et al. “Evaluation of Superabsorbent Hydrogel Composites Based on Carrageenans-Graft-Poly(sodium Acrylate) Kaolin”. Asian Journal of Chemistry, vol. 24, no. 8, Apr. 2012, pp. 3621-4, https://asianpubs.org/index.php/ajchem/article/view/9459.