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  1. By: Ruiter, Maarten De
    Type: Article
    In: The Avicultural magazine
    Volume: 104
    Issue: 3
    Date: 1998
    Page Range: 129--135
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc
  2. By: Ruiter, Maarten De
    Type: Article
    In: The Avicultural magazine
    Volume: 107
    Issue: 2
    Date: 2001
    Page Range: 49--54
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc