Mapping GPS-derived ionospheric Total Electron Content over Southern Africa during different epochs of solar cycle 23
2007 ◽
Vol 39
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pp. 821-829
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Vol 12
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pp. 308-321
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pp. A25
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1979 ◽
Vol 84
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2021 ◽
2011 ◽
Vol 47
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Vol 149
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