The generalized multireference Brillouin-Wigner coupled cluster theory is p
resented for the case of a single root function. The Bloch-like equation an
d the Lippmann-Schwinger-like equation for the generalized multireference B
rillouin-Wigner perturbation theory are obtained. These equations are then
applied to the solution of the multireference coupled cluster equations for
the case in which a single root function is required.