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- [33] Effect of polyethylene glycol 4000 in magnetic properties of 0.2SiO2-0.5FeO-0.3CaO\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\bf{0.2}{\textbf{SiO}}_{{2}}{-}{0.5}{\textbf{FeO}}{-}{0.3}{\textbf{CaO}}$$\end{document} glass ceramic Bulletin of Materials Science, 47 (3)