@inproceedings{bent1960a,
title={A priori inequalities connected with systems of partial differential equations},
author={Bent Fuglede},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203156735711919},
booktitle={Acta Mathematica},
volume={105},
number={3},
pages={177-195},
year={1960},
}
Bent Fuglede. A priori inequalities connected with systems of partial differential equations. 1960. Vol. 105. In Acta Mathematica. pp.177-195. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203156735711919.