Antibacterial and Antiparasitic Activity of Oleanolic Acid and its Glycosides isolated from Marigold (Calendula officinalis) - Szakiel, Anna; Ruszkowski, Dariusz; Grudniak, Anna; Kurek, Anna; Wolska, Krystyna I.; Doligalska, Maria; Janiszowska, Wirginia (Planta Medica, 2008)