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3by Füllekrug, M, Fraser-Smith, A.C, Bering, E.A, Few, A.AGet access
Published in Journal of Atmospheric and Solar-Terrestrial Physics (1999)
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4by Fraser-Smith, A. C., Helliwell, R. A., Lanzerotti, L. J., Rosenberg, T. J.Get access
Published in Science (1992)
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