Reference Label	Details
est unc	estimated uncertainty
Crofton 1989	M. W. Crofton, R. S. Altman, N. N. Haese, and T. Oka, J. Chem. Phys. 91, 5882-5886 (1989) Infrared Spectra of 4HeH+, 4HeD+, 3HeH+, and 3HeD+
Kolos 1976a	W. Kolos, Int. J. Quantum Chem. 10, 217-224 (1976) Long- and Intermediate-Range Interaction in Three Lowest Sigma States of the HeH+ Ion
Kolos 1976b	W.Kolos and J. M. Peek, Chem. Phys. 12, 381-386 (1976) New ab initio Potential Curve and Quasibound States of HeH+