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  1. By: Orians, Gordon H. - Røskaft, Eivin - Beletsky, Les D.
    Type: Article
    In: The Wilson bulletin
    Volume: 101
    Issue: 4
    Date: 1989
    Page Range: 599--605
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Orians, Gordon H. - King, Charles E
    Type: Article
    In: Pacific science
    Volume: 18
    Issue: 3
    Date: 1964
    Page Range: 297--306
    Publication Info: Honolulu, University Press of Hawaii,