Gupta, A., S. K. Prajapati, M. Balamurugan, M. Singh, and D. Bhatia. “Design and Development of a Proniosomal Transdermal Drug Delivery System for Captopril”. Tropical Journal of Pharmaceutical Research, vol. 6, no. 2, July 2007, pp. 687-93, doi:10.4314/tjpr.v6i2.14647.