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@unpublished{TUW-120813,
    author = {Frank, Andrew U.},
    title = {Material vs. Information Causation - An Ontological Clarification for the Information Society},
    year = {2007},
    note = {talk: 30th International Wittgenstein Symposium, Kirchberg am Wechsel; 2007-08-05 -- 2007-08-11}
}