Geodesic
Gutman index - a critical personal account
Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 46 (2021) no. 1.

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In the recent literature there are numerous publications concerned with a graph invariant named ``{ı Gutman index}'' ($\mathit{ZZ}$). In this paper, some details about the discovery of $\mathit{ZZ}$ are explained. In particular, it is pointed out that the name for $\mathit{ZZ}$ is a result of negligence, caused by a sloppy reading of the article in which $\mathit{ZZ}$ was mentioned for the first time. The main mathematical properties of $\mathit{ZZ}$ are presented. The reasons why $\mathit{ZZ}$ became popular among scholars doing research in graph theory and mathematical chemistry are discussed, and the practical applicability of $\mathit{ZZ}$ (which is minor) commented. 
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     author = {Ivan Gutman},
     title = {Gutman index - a critical personal account},
     journal = {Bulletin de l'Acad\'emie serbe des sciences. Classe des sciences math\'ematiques et naturelles},
     pages = {183 - 193},
     publisher = {mathdoc},
     volume = {46},
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     url = {http://geodesic.mathdoc.fr/item/BASS_2021_46_1_a10/}
}
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Ivan Gutman. Gutman index - a critical personal account. Bulletin de l'Académie serbe des sciences. Classe des sciences mathématiques et naturelles, Tome 46 (2021) no. 1. http://geodesic.mathdoc.fr/item/BASS_2021_46_1_a10/