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WikiPedia: Băng_trôi http://arctic.atmos.uiuc.edu/cryosphere/ http://southport.jpl.nasa.gov/polar/iceinfo.html http://www.arctic.noaa.gov/detect/animations/halfs... http://polar.ncep.noaa.gov/seaice http://journals.ametsoc.org/doi/full/10.1175/1520-... http://www.antarctica.ac.uk/met/wmc/misc/seaice/ https://books.google.com/books?id=9S55O6WzuL8C&pg=... https://www.nytimes.com/2006/03/14/world/asia/a-po... https://web.archive.org/web/20061110185125/http://... https://web.archive.org/web/20110719105150/http://...