@unpublished{TUW-288211, author = {Retscher, G{\"u}nther}, title = {Wi-Fi Positioning for Ubiquitous PNT in Challenging Urban, Transitional and Indoor Environments}, year = {2020}, note = {invited; talk: Free seminar: How to make WiFi reliant apps work in challenging urban environments, Wollongong, Australia; 2020-02-10} }