%0 Journal Article %A C. Dalfó %A M. A. Fiol %A E. Garriga %T A differential approach for bounding the index of graphs under perturbations %J The electronic journal of combinatorics %D 2011 %V 18 %N 1 %U http://geodesic.mathdoc.fr/articles/10.37236/659/ %R 10.37236/659 %F 10_37236_659