• Bust, G. S., T. W. Garner, and T. L. Gaussiran II (2004), Ionospheric Data Assimilation Three-Dimensional (IDA3D): A global, multisensor, electron density specification algorithm, J. Geophys. Res., 109, A11312, doi:10.1029/2003JA010234.
  • Coster, A., M. Pratt, B. Burke, and P. Misra (1999), Addition of dual frequency GLONASS data to GPS ionospheric modeling, paper presented at Ionospheric Effect Symposium, Off. of Nav. Res., Alexandria, Va.
  • Fridman, S. V. (1998), Reconstruction of three-dimensional ionosphere from backscatter and vertical ionograms measured by over-the-horizon radar, Radio Sci., 33(4), 11591171.
  • Fridman, S. V., and L. J. Nickisch (2001), Generalization of ionospheric tomography on diverse data sources: Reconstruction of three-dimensional ionosphere from simultaneous vertical ionograms, backscatter ionograms and total electron content data, Radio Sci., 36(5), 11291140.
  • Mitchell, C. M., and P. S. J. Spencer (2003), A three-dimensional time-dependent algorithm for ionospheric imaging using GPS, Ann. Geophys., 46(4), 678696.
  • Tikhonov, A. N., and V. Y. Arsenin (1977), Solution of Ill-Posed Problems, Halsted, New York.