@inproceedings{paul1978harmonic,
title={Harmonic estimation in certain slit regions and a theorem of Beurling and Malliavin},
author={Paul Koosis},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203248826271257},
booktitle={Acta Mathematica},
volume={142},
number={1},
pages={275-304},
year={1978},
}
Paul Koosis. Harmonic estimation in certain slit regions and a theorem of Beurling and Malliavin. 1978. Vol. 142. In Acta Mathematica. pp.275-304. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203248826271257.