@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040961, author = {Omori, F.}, issue = {1}, journal = {Bulletin of the Imperial Earthquake Investigation Committee}, month = {Mar}, note = {附図1頁}, pages = {17--20}, title = {Note on the Annual Variation of Seismic Frequency in Tokyo and Kyoto}, volume = {2}, year = {1908} }