1. On the maximal index of graphs with a prescribed number of edges
2. Some results on the largest eigenvalue of a graph;Simić;Ars Combin.,1987
3. On the largest eigenvalue of some homeomorphic graphs;Simi;Publ. Inst. Math. Beograd,1986
4. 12. Simić S. K. , On the largest eigenvalue of bicylic graphs, to appear.