1. Adaptive wavelet transform based on cross-validation method and its application to GPS multipath mitigation;Zhong;GPS Solution,2008
2. L. Lin, Remote sensing of Ionosphere using GPS measurements” 22nd Asian conference on remote sensing, 5–9 November 2001, Singapore.
3. Artificial neural networks for predicting DGPS carrier phase and pseudorange correction;Indriyatmoko;GPS Solution,2008
4. Precise Ionosphere Modeling Using Regional GPS Network Data;Gao;Journal of Global Positioning Systems,2002
5. http://en.wikipedia.org/wiki/ionosphere.