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\bibitem{He_etal2011} {\textquotedblleft}\textit{Iron catalysts for the growth of carbon nanofibers : Fe, Fe$_{3}$C or both?}{\textquotedblright}.He Z, Maurice J-L, Gohier A, Lee CS, Pribat D, Cojocaru CS, Chemistry of materials \textbf{23}, 5379 (2011).   http://doi.org/10.1021/cm202315j

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