@article{Afraimovich2004variations,
author={Afraimovich, E.L. and Astafieva, E.I. and Gokhberg, M.B. and Lapshin, V.M. and Permyakova, V.E. and Steblov, G.M. and Shalimov, S.L.},
title={Variations of the total electron content  in the ionosphere from GPS data recorded during the Hector Mine earthquake of October 16, 1999, California},
journal={Russian Journal of Earth Sciences},
publisher={Geophysical Center of the Russian Academy of Sciences},
year={2004},
pages={339-354},
volume={6},
issue={5},
}