@article{oai:rose-ibadai.repo.nii.ac.jp:00010395,
 author = {OSHIMA, Hideaki},
 journal = {Mathematical journal of Ibaraki University},
 month = {May},
 note = {application/pdf, text/plain, 論文(Article)},
 pages = {1--2},
 title = {A lower bound of nilpotency class of the group of self-homotopy classes},
 volume = {42},
 year = {2010}
}