@unpublished{TUW-279832, author = {Retscher, G{\"u}nther and Kealy, Allison}, title = {Positioning with Signals-of-Opportunity in Indoor and Transitional Environments}, year = {2019}, note = {invited; talk: 11th International Conference on Mobile Mapping Technology 2019, Shenzhen, China; 2019-05-06 -- 2019-05-08} }