@inproceedings{jouni1991respectful,
title={Respectful quasiconformal extension from dimension$n$−1 to$n$},
author={Jouni Luukkainen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203541374472609},
booktitle={Arkiv for Matematik},
volume={31},
number={2},
pages={355-376},
year={1991},
}
Jouni Luukkainen. Respectful quasiconformal extension from dimension$n$−1 to$n$. 1991. Vol. 31. In Arkiv for Matematik. pp.355-376. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203541374472609.