{"id":"000428550","type":"article","title":"Trakijskata krepost Čertigrad v Stara Planina. (Bulg.m.franz.Res.) La fortresse thrace Certigrad de Stara Planina","pages":"52-62","container-title":"Archeologija. Organ na Archeologičeskija institut i muzej pri Bălgarskata akademija na naukite, 13,4.1971","author":[{"family":"Velkov","given":"Velizar Iv."}],"issued":{"raw":"1971"}}