SEARCH Articles Figures Tables Coupled perturbed Hartree-Fock GIAO Coupled perturbed Hartree-Fock GIAO method DFT GIAO GIAO (Gauge Invariant Atomic Orbitals GIAO (gauge-including atomic GIAO (gauge-independent atomic GIAO calculations GIAO method GIAO method , chemical shift calculation GIAO theory GIAO-CHF GIAO-CHF method GIAO-MNDO GIAO-MP2 method GIAO-NMR GIAO-SCF method Gauge including/invariant atomic orbitals GIAO) Gauge-invariant atomic orbitals (GIAOs Hartree-Fock/GIAO level