Seniority-zero canonical transformation theory evaluates the first three commutators exactly in the BCH expansion by exploiting the reference structure and approximates the rest recursively, yielding errors of about 10^{-4} Hartree in numerical tests.
Intruder state avoidance multireference Møller– Plesset perturbation theory.The Journal of Chemical Physics2001,114, 3913–3925
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Seniority-Zero Canonical Transformation Theory: Reducing Truncation Error with Late Truncation
Seniority-zero canonical transformation theory evaluates the first three commutators exactly in the BCH expansion by exploiting the reference structure and approximates the rest recursively, yielding errors of about 10^{-4} Hartree in numerical tests.