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\bibitem{Berthold_etal2017} {\textquotedblleft}\textit{Tunable nitrogen-doped carbon nanoparticles from tannic acid and urea and their potential for sustainable soots}{\textquotedblright}. Berthold T, Castro CR, Winter M, Hoerpel G, Kurttepeli M, Bals S, Antonietti M, Fechler N, ChemNanoMat : chemistry of nanomaterials for energy, biology and more \textbf{3}, 311 (2017).   http://doi.org/10.1002/CNMA.201700051

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