@unpublished{TUW-229520, author = {Hinterberger, Fabian}, title = {PPP Serve - Network based GNSS Phase Biases to enhance PPP Applications: A new Service Level of GNSS Reference Station Providers}, year = {2014}, note = {talk: Retreat der Forschungsgruppe H{\"o}here Geod{\"a}sie 2014, Vienna, Austria; 2014-04-10} }