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@article{TUW-120579,
    author = {Todorova, Sonya},
    title = {Determination of the ionosphere with different space geodetic techniques},
    journal = {Technical Conference of Doctoral Study JUNIORSTAV Proceedings},
    year = {2005},
    volume = {9},
    number = {ISBN 80-214-2833-3},
    pages = {291--296}
}