(en) Robert S. Mulliken, « Electronic States and Band Spectrum Structure in Diatomic Molecules. IV. Hund's Theory; Second Positive Nitrogen and Swan Bands; Alternating Intensities », Physical Review, vol. 29, no 5, , p. 637-649 (DOI10.1103/PhysRev.29.637, Bibcode1927PhRv...29..637M, lire en ligne)
(en) Robert S. Mulliken, « Electronic States and Band Spectrum Structure in Diatomic Molecules. IV. Hund's Theory; Second Positive Nitrogen and Swan Bands; Alternating Intensities », Physical Review, vol. 29, no 5, , p. 637-649 (DOI10.1103/PhysRev.29.637, Bibcode1927PhRv...29..637M, lire en ligne)
(en) John Lennard-Jones, « The electronic structure of some diatomic molecules », Transactions of the Faraday Society, vol. 25, , p. 668-686 (DOI10.1039/TF9292500668, lire en ligne)
(en) Robert S. Mulliken, « Electronic States and Band Spectrum Structure in Diatomic Molecules. IV. Hund's Theory; Second Positive Nitrogen and Swan Bands; Alternating Intensities », Physical Review, vol. 29, no 5, , p. 637-649 (DOI10.1103/PhysRev.29.637, Bibcode1927PhRv...29..637M, lire en ligne)
(en) John Lennard-Jones, « The electronic structure of some diatomic molecules », Transactions of the Faraday Society, vol. 25, , p. 668-686 (DOI10.1039/TF9292500668, lire en ligne)