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Bellardo, T.: Scientific research in online retrieval : a critical review (1981)
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Bellardo, T.: Some attributes of online search intermediaries that relate to search outcome (1984)
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Bellardo, T.: Subject indexing : an introductory guide (1991)
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Bellardo, T.; Saracevic, T.: Online searching and search output : relationships between overlap, relevance, recall and precision (1987)
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