Variability of CODG TEC and IRI 2001 Total Electron Content (TEC) during IHY Campaign Period (21 March to 16 April 2008) at Niamey under Different Geomagnetic Activity Conditions,
Ouattara, F., R. Fleury (2011),
Scientific Research and Essays, 6, 17 p. 3609–3622,
10.5897/SRE10.1050.