Ma, Qianli Scalable Electron Correlation Methods. 7. Local Open-Shell Coupled-Cluster Methods Using Pair Natural Orbitals: PNO-RCCSD and PNO-UCCSD. [electronic resource] - Journal of chemical theory and computation May 2020 - 3135-3151 p. digital Publication Type: Journal Article ISSN: 1549-9626 Standard No.: 10.1021/acs.jctc.0c00192 doi