Address on the opening Alexander von Humboldt Season in Quito, Ecuador, on 13 February 2019 (With an introduction by Ottmar Ette). Humboldt im Netz [Internet]. 6 agosto 2019 [citato 28 marzo 2026];20(38):23-30. Disponibile su: https://www.hin-online.de/index.php/hin/article/view/283