Pourgholam, A., & Sabbaghan, M. (2021). 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. Mathematical Sciences, 15(4 (December 2021). https://doi.org/10.1007/s40096-021-00381-w