1. Aromaticity;Garratt,1971
2. Aromaticity and Antiaromaticity. Electronic and Structural Aspects;Minkin,1994
3. Advanced Organic Chemistry: Reactions, Mechanisms and Structure;Smith,2001
4. Nonbenzenoid Aromatics II;Dauben,1971
5. Are the Most Stable Fused Heterobicycles the Most Aromatic?