@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/20170108203132513833741},
booktitle={Acta Mathematica},
volume={86},
number={1},
pages={89-191},
year={1951},
}
W. K. Hayman. The maximum modulus and valency of functions meromorphic in the unit circle. 1951. Vol. 86. In Acta Mathematica. pp.89-191. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203132513833741.