@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039823,
 author = {Morita, Shigeyuki},
 issue = {2},
 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 = {405--414},
 title = {On the Pontrjagin square and the signature},
 volume = {18},
 year = {1971}
}