@Article{npg-13-409-2006,
AUTHOR = {Ida, Y. and Hayakawa, M.},
TITLE = {Fractal analysis for the ULF data during the 1993 Guam earthquake to study prefracture criticality},
JOURNAL = {Nonlinear Processes  in Geophysics},
VOLUME = {13},
YEAR = {2006},
NUMBER = {4},
PAGES = {409--412},
URL = {http://www.nonlin-processes-geophys.net/13/409/2006/},
DOI = {10.5194/npg-13-409-2006}
}