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\bibitem{Zhang_etal2017} {\textquotedblleft}\textit{Mechanisms for plasma cryogenic etching of porous materials}{\textquotedblright}. Zhang Q-Z, Tinck S, de Marneffe J-F, Zhang L, Bogaerts A, Applied physics letters \textbf{111}, 173104 (2017).   http://doi.org/10.1063/1.4999439

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