@inproceedings{jack2016periodic,
title={Periodic orbits of the ABC flow with A= B= C= 1},
author={Jack Xin, Yifeng Yu, and Andrej Zlatos},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210447213946452},
booktitle={SIAM Journal on Mathematical Analysis},
volume={48},
number={6},
pages={4087-4093},
year={2016},
}

Jack Xin, Yifeng Yu, and Andrej Zlatos. Periodic orbits of the ABC flow with A= B= C= 1. 2016. Vol. 48. In SIAM Journal on Mathematical Analysis. pp.4087-4093. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191224210447213946452.