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Eyre, J.J.: Computer-based indexing systems : implications for the book indexer (1974)
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Brooks, T.A.: Orthography as a fundamental impediment to online information retrieval (1998)
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Oster, S.: Indexes in computer documentation (1994)
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Lancaster, F.W.: Trends in subject indexing from 1957 to 2000 (1980)
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Gnoli, C.: Notation (2018)
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