Geodesic
On the Laplacian spread of trees and unicyclic graphs
Kragujevac Journal of Mathematics, Tome 34 (2010) no. 1.

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

In this paper, we determine the four trees (resp. the three unicyclic graphs), which share the second to fifth (resp. the second to fourth) largest Laplacian spreads among all the trees (resp. connected unicyclic graphs) on $n\geq 10$ (respectively $n\geq 17$) vertices. 
@article{KJM_2010_34_1_a13,
     author = {Muhuo Liu},
     title = {On the {Laplacian} spread of trees and unicyclic graphs},
     journal = {Kragujevac Journal of Mathematics},
     pages = {151 - 159},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a13/}
}
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Muhuo Liu. On the Laplacian spread of trees and unicyclic graphs. Kragujevac Journal of Mathematics, Tome 34 (2010) no. 1. http://geodesic.mathdoc.fr/item/KJM_2010_34_1_a13/