@article{TUW-120723, author = {Hobiger, Thomas and Kondo, Tetsuro and Koyama, Yasuhiro and Ichikawa, R. and Weber, Robert}, title = {Effect of the Earth's oblateness on the estimation of global vertical total electron content maps}, journal = {Geophysical Research Letters}, year = {2007}, volume = {34}, number = {11}, doi = {10.1029/2007GL029792} }