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Fuentes: http://rt.com/news/winter-snow-russia-weather-275/
http://barentsobserver.com/en/sections/articles/bellona-norilsk-nickel-lacks-environmental-transparency
http://www.xatakaciencia.com/medio-ambiente/norilsk-el-lugar-con-mayor-indice-de-recien-nacidos-con-deformidades