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Qiu, Y.; Frei, H.P.: Concept based query expansion (1993) 1.00
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Frei, H.P.; Stieger, D.: ¬The use of semantic links in hypertext information retrieval (1995) 1.00
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Frei, H.P.; Meienberg, S.: Evaluating weighted search terms as Boolean queries (1991) 1.00
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Frei, H.P.; Meienberg, S.; Schäuble, P.: ¬The perils of interpreting recall and precision values (1991) 1.00
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Frei, H.P.; Schäuble, P.: Determining the effectiveness of retrieval algorithms (1991) 1.00
```
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