In this study, we compared the modelled total electron content (TEC), i.e. ionospheric TEC derived from the latest International Reference Ionosphere (IRI) versions (viz. IRI-2007, IRI-2012 and ...
(1) THE theory of maxima and minima contains pitfalls into which have fallen such well-known mathematicians as Lagrange, Bertrand, Serret, and Todhunter. A peculiar interest, therefore, is attached to ...
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