Lacy, M. C. De, A. J. Gil, G. Rodríguez-caderot, y B. Moreno. 2008. «A Method to Estimate the Ionospheric bias by Using the New GNSS Frequencies: An Analysis of its Theoretical Accuracy in a PPP Context». Física de la Tierra 20, nº diciembre: 133-50. https://revistas.ucm.es/index.php/FITE/article/view/FITE0808110133A