Comparison between the sum-connectivity index and product-connectivity index for benzenoid hydrocarbons

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Minimum sum-connectivity indices of trees and unicyclic graphs of a given matching number (2010, methodology): “We also used both the sum-connectivity index and the product-connectivity index to approximate rather accurately the π-electron energy (Eπ ) of benzenoid hyrocarbons [ 12 ], the correlation coefficients between χ( G) and Eπ, and R(G) and Eπ being 0.9999 and 0.9992, respectively.”
Sum-connectivity index of molecular trees (2010, methodology): “In [ 15 ], we also used both the product-connectivity index and the sum-connectivity index to approximate rather accurately the π-electron energy (Eπ ) of benzenoid hyrocarbons; the correlation coefficients between χ( G) and Eπ, and R(G) and Eπ being 0.9999 and 0.9992, respectively.”
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 THE SUM-CONNECTIVITY INDEX (2011, methodology): “The applications of the sum-connectivity index have been investigated in [15, 16].”