Petia Genova-Kalou, Stefka Krumova, Maya M. Zaharieva and Nadezhda Markova 2022. Mini Review: Chemical Characterization and Evaluation of Antiviral and Antibacterial Activity of Extracts from Graptopetalum paraguayense E. Walther (Crassulaceae). American Scientific Research Journal for Engineering, Technology, and Sciences. 85, 1 (Jan. 2022), 301–312.