@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039644,
 author = {Sasano, Kazuhiro},
 issue = {3},
 journal = {Journal of the Faculty of Science, the University of Tokyo. Sect. 1 A, Mathematics = 東京大学理学部紀要. 第1類A, 数学},
 month = {Dec},
 note = {application/pdf},
 pages = {521--534},
 title = {Topological entropy and periodic of maps of the circle},
 volume = {27},
 year = {1980}
}