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  1. By: König, Claus - Straneck, Roberto
    Type: Article
    In: Stuttgarter Beiträge zur Naturkunde
    Volume: 428
    Date: 1989-07-01
    Page Range: 1--20
    Publication Info: Stuttgart, Staatliches Museum für Naturkunde,
  2. By: Marshall, Joe T. (Joe Truesdell) - Behrstock, Robert A - König, Claus
    Type: Article
    In: The Wilson bulletin
    Volume: 103
    Issue: 2
    Date: 1991
    Page Range: 311--314
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-