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2. Variations in a LF radio-signal on the occasion of the recent seismic and volcanic activity in Southern Italy;Biagi;Phys. Chem. Earth,2004
3. Precursory signature of the Kobe earthquake on VLF subionospheric signal;Hayakawa;J. Atmos. Electr.,1996
4. VLF phase anomalies associated with substorm;Kikuchi;Mem. Nat. Inst. Polar. Res. (Special Issue),1981
5. Variation in the VLF signal parameters on the Australia–Kamchatka radio path during magnetic storms;Kleimenova;Geomagnet. Aeronomy,2004