English: VB mixing diagram of benzene. The Kekulé structures are mutually transformable by the D6h point group operations C2, σv and i; a linear combination produces a ground A1g state and the first excited B2u state. Ref. Sason S. Shaik; Phillipe C. Hiberty (2008). A Chemist's Guide to Valence Bond Theory. New Jersey: Wiley-Interscience. p 201. ISBN978-0-470-03735-5.
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