SEARCH Articles Figures Tables Diatomic overlap Differential method NDDO NDDO (neglect of diatomic differential Neglect Neglect of Diatomic Differential Overlap Neglect of Diatomic Differential Overlap NDDO) Neglect of Diatomic Differential Overlap method Neglect of Diatomic Overlap Neglect of Differential Overlap Neglect of overlap Overlap differential Overlap method