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\bibitem{Liu_etal2020} {\textquotedblleft}\textit{Origin of the extra capacity in nitrogen-doped porous carbon nanofibers for high-performance potassium ion batteries}{\textquotedblright}. Liu F, Meng J, Xia F, Liu Z, Peng H, Sun C, Xu L, Van Tendeloo G, Mai L, Wu J, Journal Of Materials Chemistry A \textbf{8}, 18079 (2020).   http://doi.org/10.1039/D0TA05626J

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