@article{oai:nipr.repo.nii.ac.jp:00004109,
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {Jun},
 note = {S(会告など)},
 pages = {117--119},
 title = {Program of the Thirteenth Symposium on Coordinated Observations of the Ionosphere and the Magnetosphere in the Polar Regions},
 volume = {4},
 year = {1991}
}