MathSciDoc: An Archive for Mathematician ∫

@inproceedings{lars-christer1971eigenfunction,
  title={Eigenfunction expansions for partially hypoelliptic operators},
  author={Lars-Christer Böiers},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203448844696166},
  booktitle={Arkiv for Matematik},
  volume={10},
  number={1},
  pages={79-98},
  year={1971},
}