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  1. By: Saperas Plana, Núria - Chiva, Manel - Ribes, E - Kasinsky, Harold E - Rosenberg, E - Youson, John H. - Ausio, Juan
    Type: Article
    In: The Biological bulletin
    Volume: 186
    Date: 1994-02-01
    Page Range: 101--114
    Publication Info: Woods Hole, Mass Marine Biological Laboratory
  2. By: Beamish, R. J. - Youson, John H. - Chapman, L. A.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 115
    Issue: 4
    Date: 2001
    Page Range: 573--578
    Publication Info: Ottawa Ottawa Field-Naturalists' Club