“ Physical Chemistry Evaluation of Stability, Spreadability, in Vitro Antioxidant, and Photo-Protective Capacities of Topical Formulations Containing Calendula Officinalis L. Leaf Extract ”. Brazilian Journal of Pharmaceutical Sciences, vol. 51, no. 1, Mar. 2015, pp. 63-75, https://doi.org/10.1590/S1984-82502015000100007.