@inproceedings{paul1975local,
title={Local surjectivity in$C$^{$∞$}for a class of pseudo-differential operators},
author={Paul Godin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203459531636257},
booktitle={Arkiv for Matematik},
volume={14},
number={1},
pages={289-296},
year={1975},
}
Paul Godin. Local surjectivity in$C$^{$∞$}for a class of pseudo-differential operators. 1975. Vol. 14. In Arkiv for Matematik. pp.289-296. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203459531636257.