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13. National Centers for Environmental Information. Solar Indices Bulletin (monthly) [Internet]. National Geophysical Data Center, USA [citado 19 Sep 2017]. Disponible en: https://www.ngdc.noaa.gov/metaview/page?xml=NOAA/NESDIS/NGDC/STP/Solar/iso/xml/solar-indices -bulletin.xml&view=getDataView&header=none