Zhao, C. ., Shum, C. K., Yi, Y. ., Ge, S. ., Bilitza, D. ., & Callahan, P. . (2004). Accuracy Assessment of the TOPEX/Poseidon Ionosphere Measurements. Marine Geodesy, 27, 729. http://doi.org/10.1080/01490410490889076
Sea Level Research Group
University of Colorado