@inproceedings{harold1967a,
title={A tauberian theorem related to approximation theory},
author={Harold S. Shapiro},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203214842846056},
booktitle={Acta Mathematica},
volume={120},
number={1},
pages={279-292},
year={1967},
}