@article{2004variations,
author={, .. and , .. and , .. and , .. and , .. and , .. and , ..},
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={Геофизический центр Российской Академии Наук},
year={2004},
pages={339-354},
volume={6},
issue={5},
}