1. 1
    by Ruthven, K. K.
    Published 2001
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  2. 2
    by Ruthven, K. K.
    Published 1990
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  3. 3
    by Ruthven, K. K.
    Published 1984
    Book
  4. 4
    by Ruthven, K. K.
    Published 2002
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  5. 5
    by Ruthven, K. K.
    Published 1990
    Book