@inproceedings{j.1963solution,
title={Solution in Banach algebras of differential equations with irregular singular point},
author={J. B. Miller},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203202593504964},
booktitle={Acta Mathematica},
volume={110},
number={1},
pages={209-231},
year={1963},
}
J. B. Miller. Solution in Banach algebras of differential equations with irregular singular point. 1963. Vol. 110. In Acta Mathematica. pp.209-231. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203202593504964.