@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}, }