@article{oai:ynu.repo.nii.ac.jp:00006550,
 author = {Rosen, Ronald.H.},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf},
 pages = {37--41},
 title = {CONTRACTIBLE NEIGHBORHOODS IN MANIFOLD FACTORS},
 volume = {21},
 year = {1973}
}