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  1. 1
    by Tiefel, Hans O.
    Published in American Scientist (1991)
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  2. 2
    by Tiefel, Hans O.
    Published in American Scientist (1989)
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    E-Article
  3. 3
    by Tiefel, Hans O.
    Published in American Scientist (1985)
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  4. 4
    by Tiefel, Hans O.
    Published in American Scientist (1984)
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    E-Article
  5. 5
    by Tiefel, Hans O.
    Published in American Scientist (1979)
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    E-Article
  6. 6
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