. . . . . . "The Settlement, recruitment, and early growth and mortality of the purple sea urchin, strongylocentrotus purpuratus, and the red urchin, S. franciscanus, in a kelp bed and urchin barren ground"@en . . "The settlement, recruitment, and early growth and mortality of the purple sea urchin, Strongylocentrotus purpuratus, and the red sea urchin, S. franciscanus, in a kelp bed and urchin barren ground"@en . . . . .