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@article{TUW-221819,
    author = {Kealy, Allison and Retscher, G{\"u}nther and Schwieger, Volker},
    title = {Preface to the Special Edition of the JAG on Ubiquitous Positioning and Navigation Systems},
    journal = {Journal of Applied Geodesy},
    year = {2013},
    volume = {7},
    number = {4},
    pages = {227--230},
    doi = {10.1515/jag-2013-0018},
    note = {invited}
}