Singlet-Triplet Energy Gaps for Diradicals from Particle-Particle Random Phase Approximation

Yang Yang, Degao Peng, Ernest Davidson, and Weitao Yang. Singlet-Triplet Energy Gaps for Diradicals from Particle-Particle Random Phase Approximation. Vol. 119, no. 20, J. Phys. Chem. A, 2015, pp. 4923-32.