@article{oai:repository.dl.itc.u-tokyo.ac.jp:00037623,
 author = {Koga, Yoshimasa and Yamagata, Osamu},
 journal = {The journal of the College of Science, Imperial University, Japan = 帝國大學紀要. 理科},
 month = {},
 note = {application/pdf},
 pages = {289--311},
 title = {On the Fineness of the One Yen Silver Coin},
 volume = {3},
 year = {1890}
}