@inproceedings{dennis2013linking,,
title={LINKING, TWISTING, WRITHING, AND HELICITY ON THE 3-SPHERE AND IN HYPERBOLIC 3-SPACE},
author={Dennis DeTurck, and Herman Gluck},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160914075051750019971},
booktitle={j. differential geometry},
volume={94},
number={1},
pages={87-128},
year={2013},
}

Dennis DeTurck, and Herman Gluck. LINKING, TWISTING, WRITHING, AND HELICITY ON THE 3-SPHERE AND IN HYPERBOLIC 3-SPACE. 2013. Vol. 94. In j. differential geometry. pp.87-128. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160914075051750019971.