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- [23] Irregular B\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${{\mathcal {B}}}$$\end{document}-free Toeplitz sequences via Besicovitch’s construction of sets of multiples without density Monatshefte für Mathematik, 2022, 199 (4) : 801 - 816