@article{oai:repository.dl.itc.u-tokyo.ac.jp:00038588, author = {Omori, F.}, journal = {Publications of the Earthquake Investigation Committee in foreign languages}, month = {May}, note = {application/pdf}, pages = {78--79}, title = {IX. Duration of the Preliminary Tremor in the Earthquakes of Groups VIII A and VIII B(Horizontal Pendulum Observations of Earthquakes at Hitotsubashi (Tokyo), 1900)}, volume = {13}, year = {1903} }