MathSciDoc: An Archive for Mathematician ∫

@inproceedings{m.1969lacunas,
  title={Lacunas for hyperbolic differential operators with constant coefficients I},
  author={M. F. Atiyah, R. Bott, and L. Gårding},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203219521793090},
  booktitle={Acta Mathematica},
  volume={124},
  number={1},
  pages={109-189},
  year={1969},
}