1. Aromaticity of Polycyclic Conjugated Hydrocarbons
2. Conjugated circuits and resonance energies of benzenoid hydrocarbons
3. Wiswesser, W. J. Private communication to NT (January 29, 1988). See, also: von Knop, J.; Müller, W. R.; Szymanski, K. Nikolić, S and Trinajstić, N. Computer-oriented molecular codes. InComputational Chemical GraphTheory; Rouvray, D. H., Ed.; Nova Science Publishers: Commack, NY, 1990; pp 9−32.