Sriram Pavani, et al. “Synergistic Effect of Chemical Enhancer and Iontophoresis for Transdermal Delivery of Nebivolol Hydrochloride: Enhancement of Transdermal Drug Delivery”. Iranian Journal of Pharmaceutical Sciences, vol. 12, no. 2, Apr. 2016, pp. 9-20, doi:10.22037/ijps.v12.40773.