Lackner W. Karpozilos, Apostolos D.: The Ecclesiastical Controversy between the Kingdom of Nicaea and the Principality of Epiros (1217—1233). SOF [Internet]. 30. November 2021 [zitiert 18. Mai 2024];1(1):508-9. Verfügbar unter: https://www.suedost-forschungen.de/portal/index.php/sof/article/view/11168