{"id":"001028671","type":"book","title":"Rock-cut caves with two entrances orthe model of the cosmos","publisher":"Bulgarian Academy of Sciences","publisher-place":"Sofia","pages":"239-250","container-title":"Thracia : 15. In honour of Alexander Fol's 70th anniversary","author":[{"family":"Fol","given":"Valeriia."}],"issued":{"raw":"2003"}}