@inproceedings{aurel1956on,
title={On the principle of subordination in the theory of analytic differential equations},
author={Aurel Wintner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203145744761838},
booktitle={Acta Mathematica},
volume={96},
number={1},
pages={143-156},
year={1956},
}
Aurel Wintner. On the principle of subordination in the theory of analytic differential equations. 1956. Vol. 96. In Acta Mathematica. pp.143-156. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203145744761838.