1. Amory-Mazaudier C, Vila P, Achache J, Achy Seka A, Al-bouy Y, Blanc E, Boka K, Bouvet J, Cohen Y, Dukhan M, Doumouya V, Fambitakoye O, Gendrin R, Goutelard C, Hamoudi M, Hanbaba R, Houngninou E, Huc C, Kakou K, Kobea-Toka A, Lassudrie-Duchesne P, Mbipom E, Menvielle M, Ogunade S O, Onwumechili C A, Oyinloye J A, Rees D, Richmond A, Sambou E, Schmuker E, Tirefort J L and Vassal J 1993 International equatorial electrojet year: The African sectorm; Rev. Bras. Geofisica 11(3) 303–317.
2. Barbosa C, Alves L, Caraballo R, Hartmann G A, Papa A R R and Pirjola R J 2015 Analysis of geomagnetically induced currents at a low-latitude region over the solar cycles 23 and 24: Comparison between measurements and calculations; J. Space Weather Space Clim. 5 A35, https://doi.org/10.1051/swsc/2015036.
3. Bernhardi E H, Cilliers P J and Gaunt C T 2008 Improvement in the modeling of geomagnetically induced currents in southern Africa; South Afr. J. Sci. 104(7–8) 265–272.
4. Bernhardi E H, Tjimbandi T A, Cilliers P J and Gaunt C T 2010 16th Power Systems Computation Conference 2008 (PSCC 2008 Glasgow); Glasgow, Scotland, UK, 14–18 July 2008, Presented at the Power Systems Computation Conference, Curran, Red Hook, NY. 1391–1395, ISBN 978-1-61738-857-6.
5. Bogdan T J 2007 Space weather: Physics and effects; In: Space Weather: Physics and Effects (eds) Volker Bothmer and Ioannis A Daglis, Praxis/Springer, New York, 438p, ISBN 978-3-540-23907-9; Phys. Today 60 59–60, https://doi.org/10.1063/1.2825074.