@unpublished{TUW-296799, author = {Retscher, G{\"u}nther}, title = {Techniques and Systems for Wi-Fi Positioning}, year = {2021}, note = {invited; talk: GIS Ostrava 2021 - Advances in Localization and Navigation, Ostrava, Czech Republic; 2021-03-17 -- 2021-03-19} }