@inproceedings{bo1956a,
title={A note on an inequality},
author={Bo Kjellberg},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203420983393926},
booktitle={Arkiv for Matematik},
volume={3},
number={3},
pages={293-294},
year={1956},
}