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classification_ss:"54.65"
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classification_ss:"54.72"
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classification_ss:"06.74"
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year_i:[2010 TO 2020}
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Carstens, C.: Ontology based query expansion : retrieval support for the domain of educational research (2012)
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1.0 = *:*, product of: 1.0 = boost 1.0 = queryNorm