Zybenko, O.V. “Morphology and Vitality of Seeds of the Genus Veronica L. Introduced Species at the Donetsk Botanical Gardens of the NAS of Ukraine”. Plant Introduction 26 (June 1, 2005): 34-36. Accessed October 19, 2026. http://www.plantintroduction.org/index.php/pi/article/view/948.