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@article{TUW-121277,
    author = {Todorova, Sonya and Hobiger, Thomas and Schuh, Harald},
    title = {Using the Global Navigation Satellite System and satellite altimetry for combined Global Ionosphere Maps},
    journal = {Advances in Space Research},
    year = {2008},
    volume = {42},
    pages = {727--736}
}