Bound for Vertex PI Index in Terms of Simple Graph Parameters

@inproceedings{Das2013BoundFV,
  title={Bound for Vertex PI Index in Terms of Simple Graph Parameters},
  author={Kinkar Ch. Das and Ivan Gutman},
  year={2013}
}
The vertex PI index is a distance–based molecular structure descriptor, that recently found numerous chemical applications. In this letter we obtain a lower bound on the vertex PI index of a connected graph in terms of number of vertices, edges, pendent vertices, and clique number, and characterize the extremal graphs. 

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