This method calculates the third geometric-arithmetic (GA3) index.
a graph as a graphNEL object.
the distance matrix of g. Will be automatically calculated if not supplied.
This method returns the third geometric-arithmetic index of a graph as a double-precision floating point value.
Lavanya Sivakumar, Michael Schutte
B. Zhou and I. Gutman and B. Furtula and Z. Du: On two types of geometric-arithmetic index. Chemical Physics Letters, 482:153-155, 2009
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