SEARCH Articles Figures Tables Brillouin-Wigner coupled cluster singles Brillouin-Wigner coupled-cluster theory Brillouin-Wigner coupled-clusters Brillouin-Wigner theory Cluster coupled Coupled clustered theory Coupled-cluster theory Coupling theory Multi-reference Brillouin-Wigner coupled-cluster theory, single-root Single reference Brillouin-Wigner Single-reference Single-reference coupled-cluster theory Single-root formulation of the multi-reference Brillouin-Wigner coupled-cluster theory Single-root multi-reference Brillouin-Wigner coupled cluster theory Hilbert space approach