MathSciDoc: An Archive for Mathematician ∫

@inproceedings{lars1955on,
  title={On the theory of general partial differential operators},
  author={Lars Hörmander},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203143415283822},
  booktitle={Acta Mathematica},
  volume={94},
  number={1},
  pages={161-248},
  year={1955},
}