Some properties of the Narumi-Katayama index

@article{Gutman2012SomePO,
  title={Some properties of the Narumi-Katayama index},
  author={Ivan Gutman and Modjtaba Ghorbani},
  journal={Appl. Math. Lett.},
  year={2012},
  volume={25},
  pages={1435-1438}
}

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