Nakatsuji79a

H. Nakatsuji, “Cluster expansion of the wavefunction: Electron correlations in ground and excited states by SAC (Symmetry-Adapted-Cluster) and SAC CI theories,” Chem. Phys. Lett., 67 (1979) 329-33. DOI: 10.1016/0009-2614(79)85172-6