Veljović, Elma, et al. “Solvent-Free Synthesis and Antibacterial Activity of 14-Aryl Substituted Dibenzoxanthene Derivatives”. Bulletin of Chemists and Technologists of Bosnia and Herzegovina, vol. 46, June 2016, pp. 33-38, https://glashem.pmf.unsa.ba/index.php/bctbh/article/view/168.