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  1. By: Vishniac, Helen S - Nigrelli, Ross F. (Ross Franco),
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 42
    Issue: 11
    Date: 1957-12-31
    Page Range: 131--134
    Publication Info: New York,
  2. By: Vishniac, Helen S
    Type: Article
    In: The Biological bulletin
    Volume: 111
    Date: 1956-12-01
    Page Range: 410--414
    Publication Info: Woods Hole, Mass Marine Biological Laboratory