A. Rozhnoi, M. Solovieva, M. Parrot, M. Hayakawa, P. F. Biagi, and K. Schwingenschuh, “Ionospheric turbulence from ground-based and satellite VLF/LF transmitter signal observations for the Simushir earthquake (November 15, 2006)”, Ann. Geophys., vol. 55, no. 1, Apr. 2012.