Zahra Fahimi, Maryam Parviz, Fariba Orang, & Shahin Bonakdar. (2008). Synthesis of pH Sensitive Hydrogels Based on Poly Vinyl Alcoholand Poly Acrylic Acid: Synthesis of pH sensitive hydrogels5. Iranian Journal of Pharmaceutical Sciences, 4(4), 275–280. https://doi.org/10.22037/ijps.v4.41057