Double, Rydberg and charge transfer excitations from pairing matrix fluctuation and particle-particle random phase approximation
Yang Yang, Helen van Aggelen, and Weitao Yang. Double, Rydberg and Charge Transfer Excitations from Pairing Matrix Fluctuation and Particle-Particle Random Phase Approximation. Vol. 139, no. 22, J. Chem. Phys., 2013, p. 224105.
