@inproceedings{dexing2010time-periodic,
title={Time-periodic solutions of the Einsteins field equations II: geometric singularities},
author={DeXing Kong, Kefeng Liu, and Ming Shen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221111415414517636},
booktitle={Science China Mathematics},
volume={53},
number={6},
pages={1507-1520},
year={2010},
}
DeXing Kong, Kefeng Liu, and Ming Shen. Time-periodic solutions of the Einsteins field equations II: geometric singularities. 2010. Vol. 53. In Science China Mathematics. pp.1507-1520. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191221111415414517636.