AIMAN A. OBAIDAT. “MODULATION OF THE MICRO-ENVIRONMENTAL PH AND ITS INFLUENCE ON THE GEL LAYER BEHAVIOR AND RELEASE OF THEOPHYLLINE FROM HYDROPHILIC MATRICES”. International Journal of Pharma and Bio Sciences 4, no. 2 (June 30, 2013): 794–802. Accessed September 3, 2026. https://ijpbs.net/index.php/journal/article/view/2231.