@inproceedings{e.1952boundary,
title={Boundary theorems for a function meromorphic in the unit circle},
author={E. F. Collingwood, and M. L. Cartwright},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203133808250752},
booktitle={Acta Mathematica},
volume={87},
number={1},
pages={83-146},
year={1952},
}
E. F. Collingwood, and M. L. Cartwright. Boundary theorems for a function meromorphic in the unit circle. 1952. Vol. 87. In Acta Mathematica. pp.83-146. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203133808250752.