@inproceedings{sten1962orthogonality,
title={Orthogonality in normed linear spaces},
author={Sten Olof Carlsson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203426524131976},
booktitle={Arkiv for Matematik},
volume={4},
number={4},
pages={297-318},
year={1962},
}