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- [41] Wintgen Ideal Surfaces in Four-dimensional Neutral Indefinite Space Form \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${R^4_2(c)}$$\end{document} Results in Mathematics, 2012, 61 (3-4) : 329 - 345