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[2] G. H. Fath–Tabar, A. R. Ashrafi, I. Gutman, Note on Laplacian energy of graphs, Bull. - Acad. Serbe Sci. Arts, Cl. Sci. Math. Nat., Sci. Math. 137 (2008) 1–10.
[3] A. Ghalavand, A. R. Ashrafi, I. Gutman, Extremal graphs for the second multiplicative Zagreb index, Bull. Inter. Math. Virtual Inst. 8 (2018) 369–383.
[4] A. Ghalavand, A. R. Ashrafi, I. Gutman, New upper and lower bounds for some degree–based graph invariants, Kragujev. J. Math. 44 (2020) 181–188.
[5] I. Gutman, A. R. Ashrafi, On the PI index of phenylenes and their hexagonal squeezes, MATCH Commun. Math. Comput. Chem. 60 (2008) 135–142.
[6] I. Gutman, A. R. Ashrafi, The edge version of the Szeged index, Croat. Chem. Acta 81 (2008) 263–266.
[7] I. Gutman, A. R. Ashrafi, G. H. Fath–Tabar, Graphhay ham energy [Equienergetic graphs], Farhang
va Andishe-e-Riazi [Culture and Thinking of Mathematics] 15 (1389) 41–50. in Persian, 1389 ∼ 2011.
[8] I. Gutman, A. Ghalavand, T. Dehghan–Zadeh, A. R. Ashrafi, Graphs with smallest forgotten index, Iran. J. Math. Chem. 8 (2017) 259–273.
[9] M. Hakimi–Nezhaad, A. R. Ashrafi, I. Gutman, Note on degree Kirchhoff index of graphs, Trans. Comb. 2(3) (2013) 43–52.
[10] M. H. Khalifeh, H. Yousefi–Azari, A. R. Ashrafi, I. Gutman, The edge Szeged index of product graphs, Croat. Chem. Acta 81 (2008) 277–281.
[11] H. Khodashenas, M. J. Nadjafi–Arani, A. R. Ashrafi, I. Gutman, A new proof of the Szeged–Wiener theorem and a new characterization of block graphs, Kragujev. J. Math. 35 (2011) 165–172.
[12] H. Shabani, A. R. Ashrafi, I. Gutman, Geometric–arithmetic index: An algebraic approach, Stud. Univ. Babes-Bolyai Chem. 55 (2010) 107–112.
[13] H. Shabani, A. R. Ashrafi, I. Gutman, On revised Szeged index of graphs, Util. Math. 95 (2014) 281–288.
[14] H. Shabani, A. R. Ashrafi, I. Gutman, B. Furtula, On extensions of Wiener index, MATCH Commun. Math. Comput. Chem. 69 (2013) 589–596.
[15] M. Tavakoli, F. Rahbarnia, M. Mirzavaziri, A. R. Ashrafi, I. Gutman, Extremely irregular graphs, Kragujev. J. Math. 37 (2013) 135–139.
[16] Z. Yarahmadi, A. R. Ashrafi, I. Gutman, First and second extremal bipartite graphs with respect to PI index, Math. Comput. Model. 54 (2011) 2460–2463.
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