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\bibitem{Gielis+Brasili2021} {\textquotedblleft}\textit{The apeirogon and dual numbers}{\textquotedblright}. Gielis J, Brasili S, Symmetry : culture and science \textbf{32}, 157 (2021).   http://doi.org/10.26830/SYMMETRY_2021_2_157

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