@inproceedings{barry1974a,
title={A generalization to overdetermined systems of the notion of diagonal operators},
author={Barry Mackichan},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203235891920187},
booktitle={Acta Mathematica},
volume={134},
number={1},
pages={239-274},
year={1974},
}
Barry Mackichan. A generalization to overdetermined systems of the notion of diagonal operators. 1974. Vol. 134. In Acta Mathematica. pp.239-274. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203235891920187.