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  1. Rada, R.; Wang, W.; Birchall, A.: Retrieval hierarchies in hypertext (1993) 10.60
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    Author
    Birchall, A.
  2. Birchall, A.; Deakin, A.; Rada, R.: Knowledge automation and the need for intermediaries (1994) 10.60
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    Birchall, A.

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