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Del Sesto, R. E.; Miller, J. S.; Lafuente, P.; Novoa, J. J. (2002). "Exceptionally Long (≥2.9 Å) CC Bonding Interactions in π-[TCNE]2− 2 Dimers: Two-Electron Four-Center Cation-Mediated CC Bonding Interactions Involving π* Electrons". Chemistry: A European Journal. 8 (21): 4894–4908. doi:10.1002/1521-3765(20021104)8:21<4894::AID-CHEM4894>3.0.CO;2-2. PMID12397591.