1. The Molecular Orbital Theory of Organic Chemistry;Dewar,1969
2. The Aromatic Sextet;Clar,1972
3. Topological Approach to the Chemistry of Conjugated Molecules;Graovac,1977
4. Introduction to the Theory of Benzenoid Hydrocarbons;Gutman,1980
5. Aromaticity and Antiaromaticity. Electronic and Structural Aspects;Minkin,1994