This method calculates the modified Zagreb index.
a graph as a graphNEL object.
the degree of each node of g. Will be automatically calculated if not supplied.
This method returns the modified Zagreb index of a graph as a double-precision floating point value.
Lavanya Sivakumar, Michael Schutte
S. Nikolic and G. Kovacevic and A. Milicevic and N. Trinajstic: The Zagreb Indices 30 Years After. Croatica Chemica Acta, 76:113-124, 2003
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