@inproceedings{hao2019non-existence,
title={NON-EXISTENCE OF NEGATIVE WEIGHT DERIVATIONS ON POSITIVELY GRADED ARTINIAN ALGEBRAS},
author={HAO CHEN, Stephen S.-T. Yau, and Huaiqing Zuo},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20190626023742046285361},
booktitle={TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY},
volume={372},
number={4},
pages={2493–2535},
year={2019},
}

HAO CHEN, Stephen S.-T. Yau, and Huaiqing Zuo. NON-EXISTENCE OF NEGATIVE WEIGHT DERIVATIONS ON POSITIVELY GRADED ARTINIAN ALGEBRAS. 2019. Vol. 372. In TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY. pp.2493–2535. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20190626023742046285361.