@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033470,
 author = {Tsujiura, Masaru},
 issue = {4},
 journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo},
 month = {Feb},
 note = {application/pdf},
 pages = {973--995},
 title = {Frequency Analysis of Seismic Waves (2)},
 volume = {45},
 year = {1968}
}