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\bibitem{Gielis_etal2012} {\textquotedblleft}\textit{Universal natural shapes : from unifying shape description to simple methods for shape analysis and boundary value problems}{\textquotedblright}. Gielis J, Caratelli D, Fougerolle Y, Ricci PE, Tavkelidze I, Gerats T, PLoS ONE \textbf{7}, e29324 (2012).   http://doi.org/10.1371/JOURNAL.PONE.0029324

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