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\bibitem{Gielis_etal2020} {\textquotedblleft}\textit{A note on spirals and curvature}{\textquotedblright}. Gielis J, Caratelli D, Shi P, Ricci PE, Growth and form \textbf{1}, 1 (2020).   http://doi.org/10.2991/GAF.K.200124.001

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