@inproceedings{richard1970cohomology, title={Cohomology of operator algebras}, author={Richard V. Kadison, and John R. Ringrose}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203222172234112}, booktitle={Acta Mathematica}, volume={126}, number={1}, pages={227-243}, year={1970}, }