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Severiens, T.; Hohlfeld, M.; Zimmermann, K.; Hilf, E.R.: PhysDoc - a distributed network of physics institutions documents : collecting, indexing, and searching high quality documents by using harvest (2000)
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Veen, T. van; Oldroyd, B.: Search and retrieval in The European Library : a new approach (2004)
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Spink, A.; Wilson, T.; Ellis, D.; Ford, N.: Modeling users' successive searches in digital environments : a National Science Foundation/British Library funded study (1998)
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