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WikiPedia: Bela (chi ốc biển) http://www.conchsoc.org/resources/show-abstract-40... http://www.marinespecies.org http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail... http://www.marinespecies.org/aphia.php?p=taxdetail...