@inproceedings{w.1964on,
title={On the characteristic of functions meromorphic in the unit disk and of their integrals},
author={W. K. Hayman},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203204950863984},
booktitle={Acta Mathematica},
volume={112},
number={1},
pages={181-214},
year={1964},
}
W. K. Hayman. On the characteristic of functions meromorphic in the unit disk and of their integrals. 1964. Vol. 112. In Acta Mathematica. pp.181-214. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203204950863984.