[1]
S. A. Pulinets, A. Leyva Contreras, G. Bisiacchi-Giraldi, y L. Ciraolo, «Total eletron content variations in the ionosphere before the Colima, Mexico, earthquake of 21 January 2003», Geofis Int, vol. 44, n.º 4, pp. 369–377, oct. 2005.