@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033415,
 author = {Yukutake, Takesi and Tachinaka, Hiroko},
 issue = {5},
 journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo},
 month = {Dec},
 note = {application/pdf},
 pages = {1075--1102},
 title = {52. The Westward Drift of the Geomagnetic Secular Variation},
 volume = {46},
 year = {1968}
}