On the basis of ring topologies, some theorems for the structural fusion of condensed benzenoids are presented. It has been proved that the oddness or evenness of the fused system is dictated by the degree of fusion.
TÜRKER, Lemi (1996) "Structural Fusion of Condensed Benzenoid Systems," Turkish Journal of Chemistry: Vol. 20: No. 4, Article 8. Available at: https://journals.tubitak.gov.tr/chem/vol20/iss4/8