I. Popov, „Richard Wagner’s place in the history of ideas during the last third of the 19th century“, JGSS, Nr. 5, S. 156–172, Dez. 2025, Zugegriffen: 9. Februar 2026. [Online]. Verfügbar unter: https://periodicals.uni-sofia.bg/index.php/gsc/article/view/3269