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Niklas Luhmann, "Generalized Media and the Problem of Contingency",
in: Jan J. Loubser, Rainer C. Baum, Andrew Effrat, Victor M. Lidz (Editors), Explorations in General Theory in Social Science: Essays in Honor of Talcott Parsons, New York 1976, Bd. II, S. 507-532.
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