@inproceedings{gerd1997trace,
title={Trace expansions for pseudodifferential boundary problems for Dirac-type operators and more general systems},
author={Gerd Grubb},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203554798647715},
booktitle={Arkiv for Matematik},
volume={37},
number={1},
pages={45-86},
year={1997},
}
Gerd Grubb. Trace expansions for pseudodifferential boundary problems for Dirac-type operators and more general systems. 1997. Vol. 37. In Arkiv for Matematik. pp.45-86. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203554798647715.