?s ?p "Results of the trace-element analysis of the axe blades given in percent by weight. Upper part: results of the trace-element analysis of Zug-Riedmatt and all metallurgically similar flanged copper axes from the late 4th to 3rd millennium BC; middle: flanged axes displaying different traits; bottom part: flat axes from a chronological horizon, presumed to be before 3500 calBC . “tr.” small traces detected."@de