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WikiPedia: Cá_voi_xám http://dsp-psd.pwgsc.gc.ca/collection_2007/ec/En3-... http://pubs.aina.ucalgary.ca/arctic/Arctic34-2-186... http://www.grindtv.com/outdoor/blog/17453/gray+wha... http://www.bucknell.edu/msw3/browse.asp?id=1430003... http://mmi.oregonstate.edu/Sakhalin2010 http://www.itis.gov/servlet/SingleRpt/SingleRpt?se... //pubmed.ncbi.nlm.nih.gov/15805012 //pubmed.ncbi.nlm.nih.gov/21754984 //pubmed.ncbi.nlm.nih.gov/8412655 //www.ncbi.nlm.nih.gov/pmc/articles/PMC3130736