@article{oai:jaxa.repo.nii.ac.jp:00028900,
 author = {長井, 嗣信 and 篠原, 育 and 銭谷, 誠司 and Nagai, Tsugunobu and Shinohara, Iku and Zenitani, Seiji},
 issue = {10},
 journal = {Journal of Geophysical Research: Space Physics},
 month = {Oct},
 note = {Accepted: 2015-10-06, 資料番号: SA1150222000},
 pages = {8762--8773},
 title = {The Dawn-dusk Length of the X Line in the Near-Earth Magnetotail: Geotail Survey in 1994-2014},
 volume = {120},
 year = {2015}
}