Li, Jing-Mei, Hui Yu, Xiao-Dong Li, Qing-Zhou Zhai, and Jian Tian. 2011. “Study of Different Porous Size MCM-41 Molecular Sieve As Carrier of Captopril”. Asian Journal of Chemistry 24 (2):589-94. https://asianpubs.org/index.php/ajchem/article/view/8623.