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A Novel PH-Responsive Superabsorbent Hydrogel Based on Collagen for Ephedrine Controlled Release: Hydrogel for Ephedrine Controlled Release. Pakistan Journal of Scientific & Industrial Research 2013, 56 (2), 82-89. https://doi.org/10.52763/PJSIR.BIOL.SCI.56.2.2013.82.89.