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Haggard, Raymond. Rhodes University; 1994. The effects of particle precipitation on the ionosphere in the South Atlantic Anomaly Region.
Haggard, Raymond. Particle precipitation effects in the daytime E-region in the South Atlantic Anomaly region. 2004.
Opperman, Ben D L, Cilliers, Pierre J, McKinnell, Lee-Anne, Haggard, Raymond. Development of a regional GPS-based ionospheric TEC model for South Africa. 2007.