@article{oai:u-ryukyu.repo.nii.ac.jp:02006906,
 author = {Maehara, Hiroshi},
 issue = {13},
 journal = {琉球大学理工学部紀要. 理学編, Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences},
 month = {Jun},
 note = {紀要論文},
 pages = {1--4},
 title = {On differentiable involutions on homotopy spheres},
 year = {1970}
}