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2. : Theoretical Organic Chemistry. Butterworths, London 1959, S. 35;
3. : Carbocyclic Non-Benzenoid Aromatic Compounds. Elsevier, Amsterdam 1966.
4. Cycloheptatrienide (Tropenide) Anion
5. Base-Catalyzed Deuterium Exchange in Cycloheptatriene. Evidence for the Cycloheptatrienide Anion