Bunker, P. R., Kraemer, W. P., Yurchenko, S. N., Thiel, W., Neese, C. F., Gottfried, J. L., et al. (2007). New potential energy surfaces for the (X)over-tilde and (A)over-tilde states of CH₂⁺. Molecular Physics, 105, 1369-1376. doi:10.1080/00268970701344534.