E. C. Barnes, G. A. Petersson, J. A. Montgomery Jr., M. J. Frisch, and J. M. L. Martin, "Unrestricted Coupled Cluster and Brueckner Doubles Variations of W1 Theory," J. Chem. Theor. Comput., 5 (2009) 2687. DOI: 10.1021/ct900260g
E. C. Barnes, G. A. Petersson, J. A. Montgomery Jr., M. J. Frisch, and J. M. L. Martin, "Unrestricted Coupled Cluster and Brueckner Doubles Variations of W1 Theory," J. Chem. Theor. Comput., 5 (2009) 2687. DOI: 10.1021/ct900260g
