@incollection{TUW-253329, author = {Retscher, G{\"u}nther}, title = {Indoor Navigation}, booktitle = {Encyclopedia of Geodesy}, year = {2016}, editor = {Grafarend, E.W.}, pages = {1--7}, publisher = {Springer Verlag}, address = {Schweiz}, isbn = {978-3-319-02370-0}, doi = {10.1007/978-3-319-02370-0{\_}9-1}, note = {invited} }