@article{oai:repository.dl.itc.u-tokyo.ac.jp:00034501,
 author = {Nagata, Takesi},
 issue = {2},
 journal = {東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University},
 month = {Jun},
 pages = {411--422},
 title = {25. A `Free-Air` Reduction of Local Magnetic Anomalies},
 volume = {17},
 year = {1939}
}