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\bibitem{Shi_etal2019} {\textquotedblleft}\textit{Proportional relationship between leaf area and the product of leaf length and width of four types of special leaf shapes}{\textquotedblright}. Shi P, Liu M, Yu X, Gielis J, Ratkowsky DA, Forests (19994907) \textbf{10}, 178 (2019).   http://doi.org/10.3390/F10020178

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