@article{oai:repository.dl.itc.u-tokyo.ac.jp:00037663, author = {Tanakadate, Aikitu}, journal = {The journal of the College of Science, Imperial University, Japan = 帝國大學紀要. 理科}, month = {}, note = {application/pdf}, pages = {333--336}, title = {The Constants of a Lens}, volume = {1}, year = {1887} }