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7592981 
Journal Article 
On the Geometric-Arithmetic Index 
Rodriguez, JM; Sigarreta, JM 
2015 
1 
Match (Mülheim an der Ruhr, Germany)
ISSN: 0340-6253 
74 
1 
103-120 
WOS:000356205700007 
The concept of geometric-arithmetic index was introduced in the chemical graph theory recently, but it has shown to be useful. The aim of this paper is to obtain new inequalities involving the geometric-arithmetic index GA(1) and characterize graphs extremal with respect to them. In particular, we improve some known inequalities and we relate GA(1) to other well known topological indices.