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- [29] Regular Gδ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${G_\delta}$$\end{document}-diagonals and some upper bounds for cardinality of topological spaces Acta Mathematica Hungarica, 2016, 149 (2) : 324 - 337