@article{oai:repository.dl.itc.u-tokyo.ac.jp:00038566,
 author = {Imamura, A.},
 journal = {Publications of the Earthquake Investigation Committee in foreign languages},
 month = {Oct},
 note = {application/pdf},
 pages = {41--71},
 title = {Synodic-monthly Variation of Seismic Frequency in Japan},
 volume = {18},
 year = {1904}
}