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- authors%3a%22Niggemann%2c E.%22 2
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Fugmann, R.; Winter, J.H.: Reverse retrieval : toward analogy inferences by mechanized classification (treatise 7 on retrieval system theory) (1979)
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Fugmann, R.; Nickelsen, H.; Nickelsen, I.; Winter, J.H.: Representation of concept relations using the TOSAR system of IDC : treatise 3 on information retrieval theory (1974)
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