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.
Multi-reference Møller–Plesset theory: Computational 25 strategies for large molecules.Physical Chemistry Chemical Physics2000,2, 2075–
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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.