@inproceedings{pascal2008solvability,
title={Solvability of elliptic systems with square integrable boundary data},
author={Pascal Auscher, Andreas Axelsson, and Alan McIntosh},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203627376588979},
booktitle={Arkiv for Matematik},
volume={48},
number={2},
pages={253-287},
year={2008},
}

Pascal Auscher, Andreas Axelsson, and Alan McIntosh. Solvability of elliptic systems with square integrable boundary data. 2008. Vol. 48. In Arkiv for Matematik. pp.253-287. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203627376588979.