@inproceedings{eric2020inequalities,
title={Inequalities that sharpen the triangle inequality for sums of N functions in L^p},
author={Eric A. Carlen, Rupert L. Frank, and Elliott H. Lieb},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220310164954813151932},
booktitle={Arkiv for Matematik},
volume={58},
number={1},
pages={57-69},
year={2020},
}

Eric A. Carlen, Rupert L. Frank, and Elliott H. Lieb. Inequalities that sharpen the triangle inequality for sums of N functions in L^p. 2020. Vol. 58. In Arkiv for Matematik. pp.57-69. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220310164954813151932.