Natural resonance theory. I. General formalism. - Steven Feldgus; Clark R. Landis; Eric D. Glendening; Frank Weinhold (J. Comput. Chem., 2000)

Valence and extra-valence orbitals in main group and transition metal bonding. - Clark R. Landis; Frank Weinhold (J. Comput. Chem., 2007)

NBO 6.0: Natural bond orbital analysis program. - Eric D. Glendening; Clark R. Landis; Frank Weinhold (J. Comput. Chem., 2013)

Erratum: NBO 6.0: Natural bond orbital analysis program. - Eric D. Glendening; Clark R. Landis; Frank Weinhold (J. Comput. Chem., 2013)

18-electron rule and the 3c/4e hyperbonding saturation limit. - Clark R. Landis; Frank Weinhold (J. Comput. Chem., 2016)

NBO 7.0: New vistas in localized and delocalized chemical bonding theory. - Eric D. Glendening; Clark R. Landis; Frank Weinhold (J. Comput. Chem., 2019)