Mastan, A., et al. “EVALUATION OF THE IN VITRO ANTIOXIDANT AND ANTIBACTERIAL ACTIVITIES OF SECONDARY METABOLITES PRODUCED FROM LICHENS”. Asian Journal of Pharmaceutical and Clinical Research, vol. 7, no. 1, Jan. 2014, pp. 193-8, https://www.journals.innovareacademics.in/index.php/ajpcr/article/view/763.