@inproceedings{björn1976padé,
title={Padé approximation of matrix-valued series of Stieltjes},
author={Björn von Sydow},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203500852275269},
booktitle={Arkiv for Matematik},
volume={15},
number={1},
pages={199-210},
year={1976},
}