P.K., LAKSHMI., et al. “FORMULATION AND EVALUATION OF MEMBRANE-CONTROLLED TRANSDERMAL DRUG DELIVERY OF TOLTERODINE TARTARATE”. Asian Journal of Pharmaceutical and Clinical Research, vol. 7, no. 7, May 2014, pp. 111-5, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/1064.