@article{oai:repository.dl.itc.u-tokyo.ac.jp:00027883,
 author = {佐藤, 良輔},
 issue = {4},
 journal = {東京大学理学部弘報},
 month = {Mar},
 note = {application/pdf},
 pages = {7--8},
 title = {無題},
 volume = {20},
 year = {1989}
}