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WikiPedia: Sao biển cát http://seanet.stanford.edu/Asteroidea/index.html http://www.wallawalla.edu/academics/departments/bi... http://www.seastarsofthepacificnorthwest.info/spec... http://www.seastarsofthepacificnorthwest.info/spec... http://www.irmng.org/aphia.php?p=taxdetails&id=105... https://www.itis.gov/servlet/SingleRpt/SingleRpt?s... https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwt... https://web.archive.org/web/20120909031724/http://... https://web.archive.org/web/20120909031834/http://... https://www.gbif.org/species/2270618