Hensel, A; Bauer, R; Heinrich, M; Spiegler, V; Kayser, O; Hempel, G; Kraft, K; (2020) Challenges at the Time of COVID-19: Opportunities and Innovations in Antivirals from Nature. Planta Medica , 86 (10) pp. 659-664. 10.1055/a-1177-4396.