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Ingwersen, P.; Johansen, T.; Timmermann, P.: User-librarian negotiations and search procedures : a progress report (1980)
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Johansen, T.: ¬An outline of a non-linguistic approach to subject-relationships (1985)
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Johansen, T.: On the relationships of material subjects (1987)
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Johansen, T.: Elements of the non-linguistic approach to subject-relationships (1987)
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