Rasool, Fatima, Mahmood Ahmad, Haji Muhammad Shoaib Khan, Shujaat Ali Khan, and Ghulam Murtaza. 2011. “Comparative Dissolution Study of Metoprolol Tartrate Loaded PLGA (50:50) and PLGA (75:25) Microparticles”. Asian Journal of Chemistry 23 (9):3815-18. https://asianpubs.org/index.php/ajchem/article/view/10741.