@inproceedings{daniel1997coefficient,
title={Coefficient estimates for negative powers of the derivative of univalent functions},
author={Daniel Bertilsson},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203553618015705},
booktitle={Arkiv for Matematik},
volume={36},
number={2},
pages={255-273},
year={1997},
}

Daniel Bertilsson. Coefficient estimates for negative powers of the derivative of univalent functions. 1997. Vol. 36. In Arkiv for Matematik. pp.255-273. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203553618015705.