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A note on polyomino chains with extremum general sum-connectivity index
The general sum-connectivity index of a graph is defined as
where is
degree of the vertex , is a real number different from
and is the edge connecting the vertices . In this note, the problem
of characterizing the graphs having extremum values from a
certain collection of polyomino chain graphs is solved for . The
obtained results together with already known results (concerning extremum
values of polyomino chain graphs) give the complete solution of the
aforementioned problem