@inproceedings{wolfgang1983on,
title={On the regularity of difference schemes Part II. Regularity estimates for linear and nonlinear problems},
author={Wolfgang Hackbusch},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203514142768382},
booktitle={Arkiv for Matematik},
volume={21},
number={1},
pages={3-28},
year={1983},
}
Wolfgang Hackbusch. On the regularity of difference schemes Part II. Regularity estimates for linear and nonlinear problems. 1983. Vol. 21. In Arkiv for Matematik. pp.3-28. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203514142768382.