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- [21] Position-Sensitive Thermal and Cold Neutron Detectors with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{2}^{3}{\text{He}}$$\end{document} Gas Converter (Review) Technical Physics, 2020, 65 (4) : 493 - 513