@inproceedings{n.1983a,
title={A characterisation of Fuchsian groups of convergent type},
author={N. Th. Varopoulos},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203518567175419},
booktitle={Arkiv for Matematik},
volume={22},
number={1},
pages={293-307},
year={1983},
}