W. Kołos & L. Wolniewicz (1963). "Nonadiabatic Theory for Diatomic Molecules and Its Application to the Hydrogen Molecule". Reviews of Modern Physics. 35 (3): 473–483. Bibcode:1963RvMP...35..473K. doi:10.1103/RevModPhys.35.473.
E. Bright Wilson Jr. & J. B. Howard (1936). "The Vibration–Rotation Energy Levels of Polyatomic Molecules I. Mathematical Theory of Semirigid Asymmetrical Top Molecules". The Journal of Chemical Physics. 4 (4): 260–268. Bibcode:1936JChPh...4..260W. doi:10.1063/1.1749833.
W. Kołos & L. Wolniewicz (1963). "Nonadiabatic Theory for Diatomic Molecules and Its Application to the Hydrogen Molecule". Reviews of Modern Physics. 35 (3): 473–483. Bibcode:1963RvMP...35..473K. doi:10.1103/RevModPhys.35.473.
E. Bright Wilson Jr. & J. B. Howard (1936). "The Vibration–Rotation Energy Levels of Polyatomic Molecules I. Mathematical Theory of Semirigid Asymmetrical Top Molecules". The Journal of Chemical Physics. 4 (4): 260–268. Bibcode:1936JChPh...4..260W. doi:10.1063/1.1749833.