@article{oai:repository.dl.itc.u-tokyo.ac.jp:00028248,
 author = {松本, 幸夫},
 issue = {2},
 journal = {東京大学理学部弘報},
 month = {Jul},
 note = {結び目},
 pages = {0--1},
 title = {表紙の説明},
 volume = {13},
 year = {1981}
}