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    On the Harary index of graph operations
    (SPRINGEROPEN, 2013) Das, Kinkar C.; Xu, Kexiang; Cangul, Ismail Naci; Cevik, Ahmet Sinan; Graovac, Ante
    The Harary index is defined as the sum of reciprocals of distances between all pairs of vertices of a connected graph. In this paper, expressions for the Harary indices of the join, corona product, Cartesian product, composition and disjunction of graphs are derived and the indices for some well-known graphs are evaluated. In derivations some terms appear which are similar to the Harary index and we name them the second and third Harary index.