Trucks88a

G. W. Trucks, E. A. Salter, C. Sosa, and R. J. Bartlett, “Theory and Implementation of the MBPT Density Matrix: An Application to One-Electron Properties,” Chem. Phys. Lett., 147 (1988) 359-66. DOI: 10.1016/0009-2614(88)80249-5