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Shafer, K.E.: Evaluating Scorpion results (1998)
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Sparck Jones, K.: Some thoughts on classification for retrieval (2005)
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Ingwersen, P.; Wormell, I.: Ranganathan in the perspective of advanced information retrieval (1992)
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Sparck Jones, K.: Some thoughts on classification for retrieval (1970)
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Neuss, C.; Kent, R.E.: Conceptual analysis of resource meta-information (1995)
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