Article Takedown/Update Request

This is an update request for the document Monitoring, tracking and forecasting ionospheric perturbations using GNSS techniques by Norbert Jakowski, Yannick Béniguel, Giorgiana De Franceschi, Manuel Hernandez Pajares, Knut Stanley Jacobsen, Iwona Stanislawska, Lukasz Tomasik, René Warnant and Gilles Wautelet

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