{"id":"001177437","type":"book","title":"Nadgrobnite mogili ot rimskata epoha v Severoiztočna Bălgarija. (Săstojanie i problemi na proučvanijata.) Tumuli dated to the Roman period in northeastern Bulgaria. (Current state and problems of the studies.)","publisher-place":"Sofija","pages":"135-146","container-title":"Helis, 1 (1992","author":[{"family":"Vălčeva","given":"D."}],"issued":{"raw":"1992"}}