@unpublished{TUW-280995, author = {Retscher, G{\"u}nther}, title = {Wi-Fi Positioning for Seamless and Ubiquitous PNT for Urban, Transitional and Indoor Environments}, year = {2019}, note = {invited; talk: Guest Lecture at the Department of Geomatics of the Indian Institute of Technology Kanpur, Kanpur, India; 2019-07-11} }