@inproceedings{regina2008the,
title={THE LENGTH OF A SHORTEST GEODESIC LOOP AT A POINT},
author={Regina Rotman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160909105721646048716},
booktitle={Journal of Differential Geometry},
volume={78},
number={3},
pages={497-519},
year={2008},
}

Regina Rotman. THE LENGTH OF A SHORTEST GEODESIC LOOP AT A POINT. 2008. Vol. 78. In Journal of Differential Geometry. pp.497-519. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160909105721646048716.