Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western Turkey Earthquake (Mw = 5.7) on May 19, 2011 - Biagi, F.; Righetti, F.; Maggipinto, T.; Schiavulli, L.; Ligonzo, T.; Ermini, A.; Moldovan, I.A.; Moldovan, A.S.; Silva, H.G.; Bezzeghoud, M.; Contadakis, M.E.; Arabelos, D.N.; et al. (2012)