Geodesic
Sombor index - one year later
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 45 (2020) no. 1 
Ivan Gutman. Sombor index - one year later. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 45 (2020) no. 1. http://geodesic.mathdoc.fr/item/BASS_2020_45_1_a2/
@article{BASS_2020_45_1_a2,
     author = {Ivan Gutman},
     title = {Sombor index - one year later},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {43 - 55},
     year = {2020},
     volume = {45},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/BASS_2020_45_1_a2/}
}
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Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The Sombor index $(SO)$ is a vertex--degree--based graph invariant, invented in the Summer of 2020, and made publicly available in early 2021. In less than one year, a remarkable number (almost fifty) research papers on this topological index were produced. In the present article, we summarize the results achieved so far, and offer a few more.