@article{oai:soar-ir.repo.nii.ac.jp:00012005,
 author = {HIRATO,  Yoshihiro and KACHI,  Hideyuki and MUKAI,  Juno},
 journal = {Journal of the Faculty of Science Shinshu University},
 month = {Mar},
 note = {We denote by Rn the n-th rotatoin group and by πk(Rn) the k-th homotopy group of Rn. We determine the group structures of the homotopy groups πk(Rn) for k=21 and 22 by use of the fibration Rn₊₁ rn→Sⁿ., Article, Journal of the Faculty of Science Shinshu University 41: 1-28(2007)},
 pages = {1--28},
 title = {21-st and 22-nd homotopy groups of the n-th rotation group},
 volume = {41},
 year = {2007}
}