TY  - RPRT
TI  - DIFFERENTIABLE MAPPINGS IN THE SCHOENFLIES PROBLEM.
AU  - M Morse
PY  - 1958
DO  - 10.1073/pnas.44.10.1068
UR  - https://pubmed.ncbi.nlm.nih.gov/16590309/
ID  - 16590309
ER  -