Chowdary, K.P.R., and Srinivas Panguluri. “Olibanum Resin Coated Microcapsules of Glipizide: Preparation and Evaluation for Controlled Release”. Asian Journal of Chemistry, vol. 21, no. 7, Mar. 2010, pp. 5061-7, https://asianpubs.org/index.php/ajchem/article/view/18273.