{"id":"000537462","type":"article","title":"Three Thracian sites from the region of Isperih in the light of archaeomagnetic prospecting. (Bulg.m.engl.Res.) -","pages":"182-191","container-title":"Acta, 4.1990","author":[{"family":"Kovačeva","given":"M."}],"issued":{"raw":"1990"}}