The sum-connectivity index R'(G) of a graph G is the sum of the weights (d u + d v) -1/2of all edges uv of G, where d u and d v are the degrees of the vertices u and v in G. This index was recently introduced in [B. Zhou, N. Trinajstić, On a novel connectivity index, J. Math. Chem. 46(2009), 1252-1270]. In this paper, we give the sharp lower bound of the sum-connectivity index of n-vertex unicyclic graphs with k pendent vertices. © 201...
