On a novel connectivity index

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ON THE SUM-CONNECTIVITY INDEX (2011, methodology): “Motivated by Randić’s definition of the product-connectivity index, the sumconnectivity index of a graph G was proposed in [14], which is defined as”
On Vertex–Degree–Based Molecular Structure Descriptors (2011, background): “In the recent years, in mathematical chemistry it became a popular practice to introduce novel molecular structure descriptors (topological indices), see, for instance, [1–20].”
Sum-connectivity index of molecular trees (2010, methodology): “Lemma 1 Zhou and Trinajsti´ c [ 13 ] Let T be a tree with n vertices and p pendant vertices, where 3 ≤ p ≤ n − 2. Then”
Vertex-Degree-Based Topological Indices Over Graphs (2014, background): “Many of the well-known topological indices are particular cases of this expression ([5],[6],[18],[19],[20]).”
Minimum sum-connectivity indices of trees and unicyclic graphs of a given matching number (2010, methodology): “Recently, another connectivity index—the sum-connectivity index was proposed in [ 11 ].”
Minimum general sum-connectivity index of unicyclic graphs (2010, methodology): “Index χ−1/2 is the sum-connectivity index [ 13 ], which has already been studied and applied in the QSPR and QSAR modeling [13–16].”
On general sum-connectivity index (2010, methodology): “The sum-connectivity index of the graph G, denoted by χ = χ( G), is defined as [ 15 ]: χ = χ( G) = �”