@unpublished{TUW-213355, author = {Alizadeh, Mahdi and Schuh, Harald and Schmidt, Michael}, title = {Global multi-dimensional modeling of ionospheric electron density using GNSS measurements and IRI model}, year = {2012}, note = {talk: American Geophysical Union (AGU) Fall Meeting 2012, San Francisco, CA, USA; 2012-12-03 -- 2012-12-07} }