@article{oai:soar-ir.repo.nii.ac.jp:00012003,
 author = {HIROSE,  Masumi and MUKAI,  Juno and YOKOTA,  Ichiro},
 journal = {Journal of the Faculty of Science Shinshu University},
 month = {Mar},
 note = {It is known that the real, cornplex and quaternionic Hopf maps are constructed by the canonical homomorphisms from SO(2) → SO(2), SU(2) → SO(3) and Sp(2) → SO(5), respectively. We write their proofs explicitly. We show that the Cayley Hopf map is also constructed by the canonical homomorphism Spin(9) → SO(9)., Article, Journal of the Faculty of Science Shinshu University 42: 1-8(2009)},
 pages = {1--8},
 title = {Consideration of the Hopf maps from viewpoint of groups},
 volume = {42},
 year = {2009}
}