@article{oai:nipr.repo.nii.ac.jp:00004122,
 author = {Obara, Takahiro and Mukai, Toshifumi and Hayakawa, Hajime and Machida, Shinobu and Tsuruda, Koichiro and Nishida, Atsuhiro and Kaya, Nobuyuki},
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {May},
 note = {P(論文)},
 pages = {46--49},
 title = {Identification of polar cap boundary in the nightside sector (extendedabstract)},
 volume = {5},
 year = {1992}
}