Estrada, E.; Matamala, A. R. Generalized Graph Theoretic Indices in Chemistry. In the book: Novel Molecular Descriptors. Theory and Applications II. Mathematical Chemistry Monographs No. 9. I. Gutman and B. Furtula, Eds. University of Kragujevac, 2010 pp. 217-230

Estrada, E.; Matamala, A. R. Generalized Graph Theoretic Indices in Chemistry. In the book: Novel Molecular Descriptors. Theory and Applications II. Mathematical Chemistry Monographs No. 9. I. Gutman and B. Furtula, Eds. University of Kragujevac, 2010 pp. 217-230