@article{oai:repository.dl.itc.u-tokyo.ac.jp:00033511, author = {Tsumura, Kenshiro}, issue = {1}, journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo}, month = {Jun}, note = {application/pdf}, pages = {7--18}, title = {Determination of Earthquake Magnitude from Total Duration of Oscillation}, volume = {45}, year = {1967} }