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  1. By: Hakkarainen, Harri - Korpimaki, E - Koivunen, V - Kurki, S
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 2
    Date: 1997
    Page Range: 125--128
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-