@inproceedings{irwin1980on,
title={On the Nielsen-Thurston-Bers type of some self-maps of Riemann surfaces},
author={Irwin Kra},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203254130079295},
booktitle={Acta Mathematica},
volume={146},
number={1},
pages={231-270},
year={1980},
}
Irwin Kra. On the Nielsen-Thurston-Bers type of some self-maps of Riemann surfaces. 1980. Vol. 146. In Acta Mathematica. pp.231-270. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203254130079295.