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The modified Sombor (mSO) index of a given graph Formula: see text is symbolized with mSO and define by sum of the weights Formula: see text, where Formula: see text is the degree of a vertex Formula: see text in Formula: see text. In this work, we present the first and second maximum values of the mSO index among all Formula: see text-vertex Formula: see text-cyclic graphs. We also provide that the mSO index attains its maximum and second maximum on two classes of chemical graphs. Finally, we will present new lower and upper bounds for the mSO index of connected chemical graphs.
Eshrati et al. (Mon,) studied this question.
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