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  1. By: Zwilling, Edgar
    Type: Article
    In: The Biological bulletin
    Volume: 76
    Date: 1939-02-01
    Page Range: 90--103
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Zwilling, Edgar
    Type: Article
    In: The Biological bulletin
    Volume: 124
    Date: 1963-06-01
    Page Range: 368--378
    Publication Info: Woods Hole, Mass Marine Biological Laboratory