TY  - RPRT
TI  - Differentiable pseudo-free circle actions.
AU  - D Montgomery
AU  - C T Yang
PY  - 1971
DO  - 10.1073/pnas.68.5.894
UR  - https://pubmed.ncbi.nlm.nih.gov/16591917/
ID  - 16591917
ER  -