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by Ehrhart; Hans-Georg
by Ehrhart, Hans-Georg; Neuneck, Gotz
by Ehrhart, Hans-Georg
by Ehrhart, Hans-Georg; Staack, Michael
by Brzoska, Michael; Ehrhart, Hans-Georg; Narten, Jens
by Ehrhart, Hans-Georg; Rinke, Bernhard
by Hans-Georg Ehrhart
by Schnabel, Albrecht; Ehrhart, Hans-Georg
by Ehrhart, Hans-Georg; Pentland, Charles C.