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\bibitem{Shi_etal2021} {\textquotedblleft}\textit{Can leaf shape be represented by the ratio of leaf width to length? Evidence from nine species of Magnolia and Michelia (Magnoliaceae)}{\textquotedblright}. Shi P, Yu K, Niinemets {\"U}, Gielis J, Forests \textbf{12}, 41 (2021).   http://doi.org/10.3390/F12010041

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