{"id":"001031421","type":"book","title":"Die Burgen im mittelalterlichen Breisgau","publisher":"Thorbecke","publisher-place":"Sigmaringen","pages":"219-256","container-title":"Archäologie und Geschichte des ersten Jahrtausend in Südwestdeutschland","author":[{"family":"Zettler","given":"Alfons"}],"issued":{"raw":"1990"}}