PASPT2 is a linearized multi-reference perturbation theory that achieves strict size-extensivity and size-consistency for strongly correlated electrons by using a reference-specific zeroth-order Hamiltonian to eliminate disconnected terms.
A spin-adapted size-extensive state-specific multi-reference perturbation theory with various partitioning schemes
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PASPT2: a size-extensive and size-consistent partial-active-space multi-state multi-reference second-order perturbation theory for strongly correlated electrons
PASPT2 is a linearized multi-reference perturbation theory that achieves strict size-extensivity and size-consistency for strongly correlated electrons by using a reference-specific zeroth-order Hamiltonian to eliminate disconnected terms.