@article{oai:nipr.repo.nii.ac.jp:00004091,
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {Nov},
 note = {S(会告など)},
 pages = {105--107},
 title = {Program of the Twelfth Symposium on Coodinated Observations of the Ionosphere and Magnetosphere in the Polar Regions},
 volume = {3},
 year = {1990}
}