MathSciDoc: An Archive for Mathematician ∫

@inproceedings{ingemar1989on,
  title={On John and Nirenberg's theorem},
  author={Ingemar Wik},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203532527246535},
  booktitle={Arkiv for Matematik},
  volume={28},
  number={1},
  pages={193-200},
  year={1989},
}