Balvinder Khatri, Amandeep Singh, Bhupendra Kumar, Arghyadeep Saha. “Tansdermal Gel Formulation Designing & Evaluation: A Novel Apporach for Drug Delovery through Skin”. Design Engineering, Nov. 2021, pp. 13833 -57, http://www.thedesignengineering.com/index.php/DE/article/view/6499.