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classification_ss:"85.40 / Marketing"
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classification_ss:"658.4038 / DDC22ger"
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classification_ss:"QP 345"
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Maass, W.: Elektronische Wissensmärkte : Handel von Information und Wissen über digitale Netze (2010)
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1.0 = *:*, product of: 1.0 = boost 1.0 = queryNorm