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Zielinski, G.A.; P.A. Mayewski, L.D. Meeker, S. Whitlow and M. Twickler (1996). «A 110,000-year record of explosive volcanism from the GISP2 (Greenland) ice core». University of Washington. Quaternary Research. 45 (2): 109–118. ISSN0033-5894. doi:10.1006/qres.1996.0013A referência emprega parâmetros obsoletos |coautor= (ajuda)