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@unpublished{TUW-283463,
    author = {Retscher, G{\"u}nther},
    title = {State-of-the-art, Challenges and Perspectives for Indoor PNT Applications},
    year = {2019},
    note = {invited; talk: Conference on Researches, Results and Reviews in Geomatics (R3 in Geomatics), Naples, Italy; 2019-10-10 -- 2019-10-11}
}