@unpublished{TUW-246863, author = {Joldzic, Nina and Boisits, Janina and Weber, Robert}, title = {Regional Ionospheric Modeling based on Integer-Leveled Phase-Observations}, year = {2015}, note = {poster presentation: 12. {\"O}sterreichischer Geod{\"a}tentag, Velden; 2015-05-05 -- 2015-05-07} }