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  1. By: Jung, Robin E - Royle, J Andrew - Sauer, John R - Addison, Christopher - Rau, Rebecca D - Shirk, Jennifer L - Whissel, John C
    Type: Article
    In: Alytes: International Journal of Batrachology
    Volume: 22
    Issue: 3-4
    Date: 2005
    Page Range: 72--84
    Publication Info: Paris Museum national d'histoire naturelle 1982-
  2. By: Sauer, John R - Droege, Sam
    Type: Article
    In: The Wilson bulletin
    Volume: 102
    Issue: 2
    Date: 1990
    Page Range: 239--252
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-