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Burrill, A.B.; Xhung, Y.K.; Mann, H.A.; Johnson, P.M., The Jahn--Teller effect in the lower electronic states of benzene cation. III. The ground-state vibrations of C[sub 6]H[sub 6][sup +] and C[sub 6]D[sub 6][sup +], J. Chem. Phys., 2004, 120, 18, 8587, https://doi.org/10.1063/1.1691818 . [all data]