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A. Pourgholam and M. Sabbaghan, “SH\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${S}_{H}$$\end{document}-metric spaces and fixed-point theorems for multi-valued weak contraction mappings”, Math. Sci., vol. 15, no. 4 (December 2021), Mar. 2021, doi: 10.1007/s40096-021-00381-w.