@inproceedings{gregory2004the,
title={The biharmonic Neumann problem in Lipschitz domains},
author={Gregory C. Verchota},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203346852366666},
booktitle={Acta Mathematica},
volume={194},
number={2},
pages={217-279},
year={2004},
}