@inproceedings{per1989local, title={Local regularity of solutions to nonlinear Schrödinger equations}, author={Per Sjölin}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532204158532}, booktitle={Arkiv for Matematik}, volume={28}, number={1}, pages={145-157}, year={1989}, }