@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033836,
 author = {Kanai, Kiyoshi},
 issue = {1},
 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 = {85--95},
 title = {4. An Empirical Formula for the Spectrum of Strong Earthquake Motions},
 volume = {39},
 year = {1961}
}