Hailer, Frank; Kutschera, Verena E.; Hallström, Björn M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur; Janke, Axel (2012). "Nuclear genomic sequences reveal that Polar Bears are an old and distinct bear lineage". Science. 336 (6079): 344–347. Bibcode:2012Sci...336..344H. doi:10.1126/science.1216424. hdl:10261/58578. PMID22517859. S2CID12671275.
Hailer, Frank; Kutschera, Verena E.; Hallström, Björn M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur; Janke, Axel (2012). "Nuclear genomic sequences reveal that Polar Bears are an old and distinct bear lineage". Science. 336 (6079): 344–347. Bibcode:2012Sci...336..344H. doi:10.1126/science.1216424. hdl:10261/58578. PMID22517859. S2CID12671275.
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Hailer, Frank; Kutschera, Verena E.; Hallström, Björn M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur; Janke, Axel (2012). "Nuclear genomic sequences reveal that Polar Bears are an old and distinct bear lineage". Science. 336 (6079): 344–347. Bibcode:2012Sci...336..344H. doi:10.1126/science.1216424. hdl:10261/58578. PMID22517859. S2CID12671275.
Hailer, Frank; Kutschera, Verena E.; Hallström, Björn M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur; Janke, Axel (2012). "Nuclear genomic sequences reveal that Polar Bears are an old and distinct bear lineage". Science. 336 (6079): 344–347. Bibcode:2012Sci...336..344H. doi:10.1126/science.1216424. hdl:10261/58578. PMID22517859. S2CID12671275.
Hailer, Frank; Kutschera, Verena E.; Hallström, Björn M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur; Janke, Axel (2012). "Nuclear genomic sequences reveal that Polar Bears are an old and distinct bear lineage". Science. 336 (6079): 344–347. Bibcode:2012Sci...336..344H. doi:10.1126/science.1216424. hdl:10261/58578. PMID22517859. S2CID12671275.