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Legrand M., Hammer C., De Angelis M., Savarino J., Delmas R., Clausen H. & Johnsen S.J. (1997). Sulphur containing species(methane sulfonate and SO4) over the last climatic cycle in the Greenland Ice Core Project(central Greenland) ice core. J. Geophys. Res., 102(c12), 26663–26680.
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