SEARCH Articles Figures Tables A posteriori correction to multi-reference Brillouin-Wigner perturbation theory Brillouin-Wigner perturbation Brillouin-Wigner perturbation theory multi-reference second order Multi-reference Brillouin-Wigner perturbation theory Multi-reference Brillouin-Wigner perturbation theory for limited configuration interaction Multi-reference perturbation Single-root formulation of multi-reference Brillouin-Wigner perturbation theory