@inproceedings{w.1953on,
title={On certain extremum problems for analytic functions},
author={W. W. Rogosinski, and H. S. Shapiro},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203138580976786},
booktitle={Acta Mathematica},
volume={90},
number={1},
pages={287-318},
year={1953},
}
W. W. Rogosinski, and H. S. Shapiro. On certain extremum problems for analytic functions. 1953. Vol. 90. In Acta Mathematica. pp.287-318. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203138580976786.