@inproceedings{robert1981on,
title={On elliptic systems in$R$^{$n$}},
author={Robert B. Lockhart, and Robert C. McOwen},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203258936272331},
booktitle={Acta Mathematica},
volume={150},
number={1},
pages={125-135},
year={1981},
}