@inproceedings{w.1951the,
title={The maximum modulus and valency of functions meromorphic in the unit circle},
author={W. K. Hayman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203132652367742},
booktitle={Acta Mathematica},
volume={86},
number={1},
pages={193-257},
year={1951},
}
W. K. Hayman. The maximum modulus and valency of functions meromorphic in the unit circle. 1951. Vol. 86. In Acta Mathematica. pp.193-257. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203132652367742.