@article{2019latitudinal,
author={, .. and , .. and , .. and , ..},
title={Latitudinal variation of ionospheric TEC at Northern Hemispheric region},
journal={Russian Journal of Earth Sciences},
publisher={Геофизический центр Российской Академии Наук},
year={2019},
pages={1-11},
volume={19},
issue={1},
}