@inproceedings{robert2008ground,
title={Ground state energy of the low density Hubbard model},
author={Robert Seiringer, and Jun Yin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160824110558012793433},
booktitle={Journal of Statistical Physics},
volume={131},
number={6},
pages={1139-1154},
year={2008},
}

Robert Seiringer, and Jun Yin. Ground state energy of the low density Hubbard model. 2008. Vol. 131. In Journal of Statistical Physics. pp.1139-1154. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160824110558012793433.