M. Sadeghi and N. Ghasemi, “Syntheses and Swelling Kinetics Study of Gelatin-g-poly(acrylamide-co-2-acrylamido-2-methyl Propane Sulfonic Acid) Superabsorbent Hydrogel with Salt-Sensitivity Properties”, ajc, vol. 24, no. 5, pp. 2049–2053, Jan. 2012.