@inproceedings{alexander2012padé,
title={Padé approximants for functions with branch points — strong asymptotics of Nuttall–Stahl polynomials},
author={Alexander I. Aptekarev, and Maxim L. Yattselev},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203405782312809},
booktitle={Acta Mathematica},
volume={215},
number={2},
pages={217-280},
year={2012},
}

Alexander I. Aptekarev, and Maxim L. Yattselev. Padé approximants for functions with branch points — strong asymptotics of Nuttall–Stahl polynomials. 2012. Vol. 215. In Acta Mathematica. pp.217-280. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203405782312809.