@Article{nhess-3-249-2003,
AUTHOR = {Plotkin, V. V.},
TITLE = {GPS detection of ionospheric perturbation before the 13 February 2001, El Salvador earthquake},
JOURNAL = {Natural Hazards and Earth System Science},
VOLUME = {3},
YEAR = {2003},
NUMBER = {3/4},
PAGES = {249--253},
URL = {http://www.nat-hazards-earth-syst-sci.net/3/249/2003/},
DOI = {10.5194/nhess-3-249-2003}
}