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  1. Bollmann-Sdorra, P.: Probleme der Validität bei Retrievaltests (1990) 10.32 
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  2. Bollmann-Sdorra, P.; Raghavan, V.V.: On the delusiveness of adopting a common space for modelling IR objects : are queries documents? (1993) 10.32 
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  3. Bollmann-Sdorra, P.; Raghavan, V.V.: On the necessity of term dependence in a query space for weighted retrieval (1998) 10.32 
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