@inproceedings{l.1970a,
title={A non-linear Hodge-de Rham theorem},
author={L. M. Sibner, and R. J. Sibner},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203220107150095},
booktitle={Acta Mathematica},
volume={125},
number={1},
pages={57-73},
year={1970},
}