@article{oai:ynu.repo.nii.ac.jp:00000009,
 author = {Nishimura, Takashi and Ishikawa, Goo},
 journal = {Kodai Mathematical Journal},
 month = {},
 note = {application/pdf, A characterization of a C^s submanifold of Euclidean space which can become a C^r retract of some C^r retraction, (0≦r≦s≦∞), is given.},
 pages = {260--265},
 title = {Smooth retracts of euclidean space},
 volume = {18},
 year = {1995}
}