Mitrovic, Tatjana, et al. “Platismatia Glaucia and Pseudevernia Furfuracea Lichens As Sources of Antioxidant, Antimicrobial and Antibiofilm Agents”. EXCLI Journal, vol. 13, Aug. 2014, pp. 938-53, https://www.excli.de/index.php/excli/article/view/752.