@inproceedings{michael1995equivariant,
title={Equivariant isotopy of unknots to round circles},
author={Michael H Freedman, and Feng Luo},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224205935520494375},
booktitle={Topology and its Applications},
volume={64},
number={1},
pages={59-74},
year={1995},
}
Michael H Freedman, and Feng Luo. Equivariant isotopy of unknots to round circles. 1995. Vol. 64. In Topology and its Applications. pp.59-74. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224205935520494375.