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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hoyo, J Del - Collar, Nigel J
    Type: Article
    In: Forktail
    Volume: 27
    Date: 2011
    Page Range: 112--113
    Publication Info: Oxford,
  2. By: Collar, Nigel J - Hoyo, J Del - Jutglar, F
    Type: Article
    In: Forktail
    Volume: 31
    Date: 2015
    Page Range: 13--23
    Publication Info: Oxford,