@lisarosa Willke, Helmut, 1994: Systemtheorie II: Interventionstheorie. 4. Aufl. Stuttgart: UTB. Zitatfundstelle S. 5 unten.— Basti Hirsch ッ (@cervus) August 25, 2012
@lisarosa Willke, Helmut, 1994: Systemtheorie II: Interventionstheorie. 4. Aufl. Stuttgart: UTB. Zitatfundstelle S. 5 unten.
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