@article{oai:repository.dl.itc.u-tokyo.ac.jp:00041061,
 author = {Takeuchi, Mitsuhiro},
 journal = {Scientific papers of the College of General Education, University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {127--130},
 title = {There Exists a Hopf Algebra Whose Antipode is not Injective},
 volume = {21},
 year = {1971}
}