@article{oai:ynu.repo.nii.ac.jp:00006446,
 author = {Tokuda, Hirotaro},
 issue = {1},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf},
 pages = {23--39},
 title = {SINGULARITIES OF n-SPHERES IN (n+2) -SPACE},
 volume = {11},
 year = {1963}
}