@article{oai:nipr.repo.nii.ac.jp:00004214,
 author = {Nakazaki,Akira and Okuzawa,Takashi},
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {Jan},
 note = {P(論文)},
 pages = {131--134},
 title = {A first-step improvement of spline function method in ionospheric tomography (extended abstract)},
 volume = {10},
 year = {1997}
}