@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000350, author = {KNOTT, C. G.}, journal = {Transactions of the Seismological Society of Japan}, month = {}, note = {application/pdf}, pages = {41--45}, title = {M. DE BALLORE'S CALCULATIONS ON EARTHQUAKE FREQUENCY}, volume = {15}, year = {1890} }