1. Annulenes
2. Non-benzenoid Conjugated Carbocyclic Compounds;Lloyd,1984
3. Annulenes, Benzo-, Hetero-, Homo-Derivatives and their Valence Isomers;Balaban,1987
4. Aromaticity and Antiaromaticity;Minkin,1994
5. A Chemist’s Guide to Valence Bond Theory;Shaik,2008