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Muñoz, O, Volten, H, Hovenier, J. W, Veihelmann, B, van der Zande, W. J, Waters, L. B. F. M, & Rose, W. I. (2004). Scattering matrices of volcanic ash particles of Mount St. Helens, Redoubt, and Mount Spurr Volcanoes. J. Geophys. Res., 109. doi:10.1029/2004jd004684