@article{TUW-202537, author = {Alizadeh, Mahdi and Schuh, Harald and Todorova, Sonya and Schmidt, Michael}, title = {Global Ionosphere Maps of VTEC from GNSS, Satellite Altimetry and Formosat-3/COSMIC Data}, journal = {Journal of Geodesy}, year = {2011}, volume = {85}, number = {12}, pages = {975--987}, doi = {10.1007/s00190-011-0449-z} }