Reference Label	Details
Bishop 1985	D. M. Bishop and S. A. Solunac, Phys. Rev. Lett. 55, 1986-1988 (1985) Breakdown of the Born-Oppenheimer Approximation in the Calculation of Electric Hyperpolarizabilities Erratum: Phys. Rev. Lett. 55, 2627-2627 (1985) [DOI: 10.1103/PhysRevLett.55.2627.2]