{"id":"001296526","type":"book","title":"Das Bulgarenzarenreich und das Papsttum in der Periode Ende des 12. -Mitte des 14. Jahrhunderts","pages":"375-389","container-title":"Thracia, 18 (2009","author":[{"family":"Giuzelev","given":"Vasil"}],"issued":{"raw":"2009"}}