The Wiener-type indices of the corona of two graphs.

The corona of two graphs G and H, written as G circle dot H, is the graph obtained by taking one copy of G and vertical bar V(G)vertical bar copies of H, and then joining the ith vertex of G to every vertex in the ith copy of H. In this paper, we present the explicit formulae for the Wiener, hyper-Wiener and reverse-Wiener indices of the corona of two graphs.