@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033936,
 author = {Yoshiyama, Ryoichi},
 issue = {4},
 journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo},
 month = {Mar},
 note = {application/pdf},
 pages = {627--640},
 title = {The Ratio of the Velocity of P and S Waves},
 volume = {35},
 year = {1958}
}