@article{oai:repository.dl.itc.u-tokyo.ac.jp:00027847,
 author = {折戸, 周治},
 issue = {3},
 journal = {東京大学理学部弘報},
 month = {Dec},
 note = {（付;目次）},
 pages = {0--1},
 title = {表紙の説明},
 volume = {21},
 year = {1989}
}