Datta-Barua, S., T. Walter, S. Pullen, and P. Enge, Modeling the 20 November 2003 Ionosphere Storm with GRACE, Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2840-2848.
Datta-Barua, S., T. Walter, S. Pullen, and P. Enge, Modeling the 31 October 2003 Localized Enhancement with Space- and Ground-Based Data, Proceedings of the International Beacon Satellite Symposium, Chestnut Hill, MA, June 2007.
Gao, G. X., S. Datta-Barua, T. Walter, and P. Enge, Ionosphere Effects for Wideband GNSS Signals, Proceedings of the 63rd Annual Meeting of The Institute of Navigation (2007), Cambridge, MA, April 2007, pp. 147-155.