Geodesic
Irregularity Sombor index
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 48 (2023) no. 1

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The irregularity Sombor index \emph{ISO} is a recently introduced measure for graph irregularity, defined as the sum over all pairs of adjacent vertices $u,v$ of the term $\sqrt{|d_u^2-d_v^2|}$, where $d_u$ is the degree of the vertex $u$. Some basic mathematical properties of \emph{ISO} are established. 
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     title = {Irregularity {Sombor} index},
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I. Gutman; V. R. Kulli; I. Redžepović. Irregularity Sombor index. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 48 (2023) no. 1. http://geodesic.mathdoc.fr/item/BASS_2023_48_1_a2/