@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033342,
 author = {Nagumo, Shozaburo},
 issue = {6},
 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 = {1029--1033},
 title = {48. Derivation of the Utsu-Seki Formula for the Aftershock Area and the Magnitude of the Principal Shock from Deformation ～ Fracture Relation in the Earthquake Genesis},
 volume = {47},
 year = {1969}
}