``Important Configurations in Configuration Interaction and Coupled-Cluster Wave Functions,'' M. L. Abrams and C. D. Sherrill, Chem. Phys. Lett. 412, 121-124 (2005).

Using a new general-order determinant-based program, we construct compact configuration interaction and coupled-cluster wave functions by selecting the most important configurations, by weight, from a full configuration interaction or full coupled-cluster wave function. Our results show that for the symmetric dissociation of water, chemical accuracy can be achieved across the surface with ~2% of the full coupled-cluster expansion compared to ~10% of the full configuration interaction expansion.