@inproceedings{n.1965half-order, title={Half-order differentials on Riemann surfaces}, author={N. S. Hawley, and M. Schiffer}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203208499187010}, booktitle={Acta Mathematica}, volume={115}, number={1}, pages={199-236}, year={1965}, }