1. Gutman, I, Furtula, B: Novel Molecular Structure Descriptors - Theory and Applications, vol. 1. Univ. Kragujevac, Kragujevac (2010)
2. Gutman, I, Furtula, B: Novel Molecular Structure Descriptors - Theory and Applications, vol. 2. Univ. Kragujevac, Kragujevac (2010)
3. Xu, K, Das, KC, Trinajstić, N: The Harary Index of a Graph. Springer, Heidelberg (2015)
4. Furtula, B, Gutman, I, Dehmer, M: On structure-sensitivity of degree-based topological indices. Appl. Math. Comput. 219, 8973-8978 (2013)
5. Gutman, I: Degree-based topological indices. Croat. Chem. Acta 86, 351-361 (2013)