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\bibitem{Safdar_etal2018} {\textquotedblleft}\textit{Progress toward catalytic micro- and nanomotors for biomedical and environmental applications}{\textquotedblright}. Safdar M, Khan SU, J{\"a}nis J, Advanced Materials \textbf{30}, 1703660 (2018).   http://doi.org/10.1002/ADMA.201703660

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