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\bibitem{Shi_etal2020} {\textquotedblleft}\textit{The generalized Gielis geometric equation and its application}{\textquotedblright}. Shi P, Ratkowsky DA, Gielis J, Symmetry-Basel \textbf{12}, 645 (2020).   http://doi.org/10.3390/SYM12040645

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