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“Features of annual and semiannual variations derived from the global ionospheric maps of total electron content”, in Annales Geophysicae, 2008.
, “Far-ultraviolet signature of polar cusp during southward IMF Bz observed by TIMED/Global Ultraviolet Imager and DMSP”, Journal of Geophysical Research: Space Physics (1978–2012), vol. 110, 2005.
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