@article{oai:repository.dl.itc.u-tokyo.ac.jp:00034988,
 author = {Tsuboi, Chuji},
 issue = {3},
 journal = {東京帝國大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, Tokyo Imperial University},
 month = {Apr},
 note = {application/pdf},
 pages = {457--466},
 title = {Observation on the Time Variation of the Second Space Derivatives of the Gravitational Potential. (Part 1)},
 volume = {7},
 year = {1930}
}