@article{oai:tohoku.repo.nii.ac.jp:00011799,
 author = {Matsuzawa, Toru and Hasegawa, Akira and Takagi, Akio},
 issue = {1-2},
 journal = {The science reports of the Tohoku University. Fifth series, Tohoku geophysical journal},
 month = {Mar},
 note = {application/pdf, 紀要類 (bulletin), 2017065 bytes},
 pages = {21--33},
 title = {Qp Structure beneath the Northeastern Japan Arc Estimated from Twofold Spectral Ratio Method},
 volume = {32},
 year = {1989}
}