@article{oai:ynu.repo.nii.ac.jp:00006635,
 author = {Ikeda, Hiroshi and Yamashita, Masakatsu},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf},
 pages = {109--117},
 title = {CLOSED 4-MANIFOLDS COVERED BY THREE 4-BALLS},
 volume = {26},
 year = {1978}
}