1. Graph Theory;Bondy,2008
2. Bound for vertex PI index in terms of simple graph parameters;Das;Filomat,2013
3. A unified approach to the extremal Zagreb indices for trees, unicyclic graphs and bicyclic graph;Deng;MATCH Commun. Math. Comput. Chem.,2007
4. On the PI index of a graph;Deng;MATCH Commun. Math. Comput. Chem.,2008
5. The first Zagreb index 30 years after;Gutman;MATCH Commun. Math. Comput. Chem.,2004