J Cizek 1966 coupled-cluster ansatz e^T |HF>; modern CCSD(T) gold-standard 0.1 kcal/mol thermochem; Bartlett-Musial 2007 review.
J Cizek 1966 coupled-cluster ansatz e^T |HF>; modern CCSD(T) gold-standard 0.1 kcal/mol thermochem; Bartlett-Musial 2007 review.