, University of Electro-Communications: Graduate School of Informatics and Engineering; Research Station on Seismo Electromagnetics; Center for Space Science and Radio Engineering, Tokyo, Japan

• Annals of Geophysics Vol. 55 No. 1 (2012) - EARTHQUAKE PRECURSORS / Special Issue ed. by P.F. Biagi, M.E. Contadakis, M. Hayakawa and T. Maggipinto
  Ionospheric perturbations associated with two huge earthquakes in Japan, using principal component analysis for multiple subionospheric VLF/LF propagation paths
  Abstract  PDF