Mawardi, P., and F. Yanuar. “Evaluating the Difference of Skin Elasticity Value on the Use of 3% Superoxide Dismutase Cream and 10% Urea”. Journal of Pakistan Association of Dermatologists, vol. 31, no. 3, Apr. 2022, pp. 387-90, http://www.jpad.com.pk/index.php/jpad/article/view/1681.