@article{Dali2019characteristics, author={Dali, Y.. and Tiemin, Z.. and Jihong, W.. and Jianqing, W.. and Linmao, W.. and Xu, Z.. and Hongyan, P..}, title={Characteristics of double sodium layer over Haikou, China (20.0° N, 110.1° E)}, journal={Solar-Terrestrial Physics}, publisher={INFRA-M Academic Publishing LLC.}, year={2019}, pages={28-32}, volume={5}, issue={2}, }