@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040970,
 author = {Omori, F.},
 issue = {4},
 journal = {Bulletin of the Imperial Earthquake Investigation Committee},
 month = {Aug},
 note = {application/pdf},
 pages = {192--193},
 title = {Long Period Horizontal Pendulum},
 volume = {1},
 year = {1907}
}