@article{oai:repository.dl.itc.u-tokyo.ac.jp:00000273,
 author = {EWING, J. A.},
 journal = {Transactions of the Seismological Society of Japan},
 month = {},
 note = {application/pdf},
 pages = {111--114},
 title = {ON THE OBSERVATION OF AN EARTHQUAKE AT THREE OR MORE STATIONS TO DETERMINE SPEED AND DIRECTION OF TRANSIT},
 volume = {3},
 year = {1881}
}