@inproceedings{richard2018optimal,
title={Optimal stretching for lattice points and eigenvalues},
author={Richard S. Laugesen, and Shiya Liu},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191204094207996274564},
booktitle={Arkiv for Matematik},
volume={56},
number={1},
pages={111-145},
year={2018},
}

Richard S. Laugesen, and Shiya Liu. Optimal stretching for lattice points and eigenvalues. 2018. Vol. 56. In Arkiv for Matematik. pp.111-145. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20191204094207996274564.