On the Atom Bond Connectivity Index of Titania Nanotubes TiO2 (m, n)

2017 Iraqi Journal of Science  
Let G(V,E) be a simple molecular graph, for a graph G(V,E) with vertex(atom) set V and the edge(bond) set E, the third version of atom bond connectivity index is defined as .
doi:10.24996/ijs.2017.58.4c.15 fatcat:o2kdmob4l5bwfnjnfm7jmwsdx4