by Franco Molina, Osvaldo Battelli
Published in Annals of geophysics (23.02.2010)

by Chiappini, Massimo, Battelli, Osvaldo, Bushati, Salvatore, Dominici, Guido, Duka, Bejo, Meloni, Antonio
Published in Journal of geomagnetism and geoelectricity (01.01.1997)