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\bibitem{Wang_etal2014} {\textquotedblleft}\textit{Magnetically decorated multiwalled carbon nanotubes as dual MRI and SPECT contrast agents}{\textquotedblright}. Wang JTW, Cabana L, Bourgognon M, Kafa H, Protti A, Venner K, Shah AM, Sosabowski JK, Mather SJ, Roig A, Ke X, Van Tendeloo G, de Rosales RTM, Tobias G, Al-Jamal KT, Advanced functional materials \textbf{24}, 1880 (2014).   http://doi.org/10.1002/adfm.201302892

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