@inproceedings{jonathan1984adjoint,
title={Adjoint boundary value problems for the biharmonic equation on$C$^{$1$}domains in the plane},
author={Jonathan Cohen, and John Gosselin},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203520208505432},
booktitle={Arkiv for Matematik},
volume={23},
number={1},
pages={217-240},
year={1984},
}
Jonathan Cohen, and John Gosselin. Adjoint boundary value problems for the biharmonic equation on$C$^{$1$}domains in the plane. 1984. Vol. 23. In Arkiv for Matematik. pp.217-240. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203520208505432.